Cirrus: Migrate multiarch build off github actions

The github actions workflow for this operation is complex and difficult
to maintain.  For several months now a replacement has been running well
in the podman repository.  It's scripts/components are centralized,
versioned, unit, and integration tested.  Add cirrus tasks to run the
build, and another task to allow test builds in a PR.

This also adds support for a new magic CI string: `[CI:BUILD]`.
With this string in the PR title, automation will only do basic build
verification, and enable testing of the multi-arch build process.

Otherwise, many tasks were updated to not be created when running the
cirrus-cron multi-arch image builds, since this would simply be a waste
of time and invitation for flakes.

Lastly, since only native tooling is used in the new build process,
rename all the recipes to `Containerfile`.

Signed-off-by: Chris Evich <cevich@redhat.com>

.github/workflows/multi-arch-build.yaml

@@ -1,212 +0,0 @@
----
-
-# Please see contrib/<reponame>image/README.md for details on the intentions
-# of this workflow.
-#
-# BIG FAT WARNING:  This workflow is duplicated across containers/skopeo,
-#                   containers/buildah, and containers/podman.  ANY AND
-#                   ALL CHANGES MADE HERE MUST BE MANUALLY DUPLICATED
-#                   TO THE OTHER REPOS.
-
-name: build multi-arch images
-
-on:
-  # Upstream tends to be very active, with many merges per day.
-  # Only run this daily via cron schedule, or manually, not by branch push.
-  schedule:
-    - cron:  '0 8 * * *'
-  # allows to run this workflow manually from the Actions tab
-  workflow_dispatch:
-
-permissions:
-  contents: read
-
-jobs:
-  multi:
-    name: multi-arch image build
-    env:
-      REPONAME: skopeo  # No easy way to parse this out of $GITHUB_REPOSITORY
-      # Server/namespace value used to format FQIN
-      REPONAME_QUAY_REGISTRY: quay.io/skopeo
-      CONTAINERS_QUAY_REGISTRY: quay.io/containers
-      # list of architectures for build
-      PLATFORMS: linux/amd64,linux/s390x,linux/ppc64le,linux/arm64
-      # Command to execute in container to obtain project version number
-      VERSION_CMD: "--version"  # skopeo is the entrypoint
-
-    # build several images (upstream, testing, stable) in parallel
-    strategy:
-      # By default, failure of one matrix item cancels all others
-      fail-fast: false
-      matrix:
-        # Builds are located under contrib/<reponame>image/<source> directory
-        source:
-          - upstream
-          - testing
-          - stable
-    runs-on: ubuntu-latest
-    # internal registry caches build for inspection before push
-    services:
-      registry:
-        image: quay.io/libpod/registry:2
-        ports:
-          - 5000:5000
-    steps:
-      - name: Checkout
-        uses: actions/checkout@629c2de402a417ea7690ca6ce3f33229e27606a5 # v2
-
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@27d0a4f181a40b142cce983c5393082c365d1480 # v1
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@94ab11c41e45d028884a99163086648e898eed25 # v1
-        with:
-          driver-opts: network=host
-          install: true
-
-      - name: Build and locally push image
-        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a # v2
-        with:
-          context: contrib/${{ env.REPONAME }}image/${{ matrix.source }}
-          file: ./contrib/${{ env.REPONAME }}image/${{ matrix.source }}/Dockerfile
-          platforms: ${{ env.PLATFORMS }}
-          push: true
-          tags: localhost:5000/${{ env.REPONAME }}/${{ matrix.source }}
-
-      # Simple verification that stable images work, and
-      # also grab version number use in forming the FQIN.
-      - name: amd64 container sniff test
-        if: matrix.source == 'stable'
-        id: sniff_test
-        run: |
-          podman pull --tls-verify=false \
-                            localhost:5000/$REPONAME/${{ matrix.source }}
-          VERSION_OUTPUT=$(podman run \
-                           localhost:5000/$REPONAME/${{ matrix.source }} \
-                           $VERSION_CMD)
-          echo "$VERSION_OUTPUT"
-          VERSION=$(awk -r -e "/^${REPONAME} version /"'{print $3}' <<<"$VERSION_OUTPUT")
-          test -n "$VERSION"
-          echo "::set-output name=version::$VERSION"
-
-      - name: Generate image FQIN(s) to push
-        id: reponame_reg
-        run: |
-          if [[ "${{ matrix.source }}" == 'stable' ]]; then
-            # The command version in image just built
-            VERSION='v${{ steps.sniff_test.outputs.version }}'
-            # workaround vim syntax-highlight bug: '
-            # Push both new|updated version-tag and latest-tag FQINs
-            FQIN="$REPONAME_QUAY_REGISTRY/stable:$VERSION,$REPONAME_QUAY_REGISTRY/stable:latest"
-          elif [[ "${{ matrix.source }}" == 'testing' ]]; then
-            # Assume some contents changed, always push latest testing.
-            FQIN="$REPONAME_QUAY_REGISTRY/testing:latest"
-          elif [[ "${{ matrix.source }}" == 'upstream' ]]; then
-            # Assume some contents changed, always push latest upstream.
-            FQIN="$REPONAME_QUAY_REGISTRY/upstream:latest"
-          else
-            echo "::error::Unknown matrix item '${{ matrix.source }}'"
-            exit 1
-          fi
-          echo "::warning::Pushing $FQIN"
-          echo "::set-output name=fqin::${FQIN}"
-          echo '::set-output name=push::true'
-
-      # This is substantially similar to the above logic,
-      # but only handles $CONTAINERS_QUAY_REGISTRY for
-      # the stable "latest" and named-version tagged images.
-      - name: Generate containers reg. image FQIN(s)
-        if: matrix.source == 'stable'
-        id: containers_reg
-        run: |
-          VERSION='v${{ steps.sniff_test.outputs.version }}'
-          # workaround vim syntax-highlight bug: '
-          # Push both new|updated version-tag and latest-tag FQINs
-          FQIN="$CONTAINERS_QUAY_REGISTRY/$REPONAME:$VERSION,$CONTAINERS_QUAY_REGISTRY/$REPONAME:latest"
-          echo "::warning::Pushing $FQIN"
-          echo "::set-output name=fqin::${FQIN}"
-          echo '::set-output name=push::true'
-
-      - name: Define LABELS multi-line env. var. value
-        run: |
-          # This is a really hacky/strange workflow idiom, required
-          # for setting multi-line $LABELS value for consumption in
-          # a future step.  There is literally no cleaner way to do this :<
-          # https://docs.github.com/en/actions/reference/workflow-commands-for-github-actions#multiline-strings
-          function set_labels() {
-            echo 'LABELS<<DELIMITER' >> "$GITHUB_ENV"
-            for line; do
-                echo "$line" | tee -a "$GITHUB_ENV"
-            done
-            echo "DELIMITER" >> "$GITHUB_ENV"
-          }
-
-          declare -a lines
-          lines=(\
-            "org.opencontainers.image.source=https://github.com/${GITHUB_REPOSITORY}.git"
-            "org.opencontainers.image.revision=${GITHUB_SHA}"
-            "org.opencontainers.image.created=$(date -u --iso-8601=seconds)"
-          )
-
-          # Only the 'stable' matrix source obtains $VERSION
-          if [[ "${{ matrix.source }}" == "stable" ]]; then
-            lines+=(\
-              "org.opencontainers.image.version=${{ steps.sniff_test.outputs.version }}"
-            )
-          fi
-
-          set_labels "${lines[@]}"
-
-      # Separate steps to login and push for $REPONAME_QUAY_REGISTRY and
-      # $CONTAINERS_QUAY_REGISTRY are required, because 2 sets of credentials
-      # are used and namespaced within the registry.  At the same time, reuse
-      # of non-shell steps is not supported by Github Actions nor are YAML
-      # anchors/aliases, nor composite actions.
-
-      # Push to $REPONAME_QUAY_REGISTRY for stable, testing. and upstream
-      - name: Login to ${{ env.REPONAME_QUAY_REGISTRY }}
-        uses: docker/login-action@dd4fa0671be5250ee6f50aedf4cb05514abda2c7 # v1
-        if: steps.reponame_reg.outputs.push == 'true'
-        with:
-          registry: ${{ env.REPONAME_QUAY_REGISTRY }}
-          # N/B: Secrets are not passed to workflows that are triggered
-          #      by a pull request from a fork
-          username: ${{ secrets.REPONAME_QUAY_USERNAME }}
-          password: ${{ secrets.REPONAME_QUAY_PASSWORD }}
-
-      - name: Push images to ${{ steps.reponame_reg.outputs.fqin }}
-        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a # v2
-        if: steps.reponame_reg.outputs.push == 'true'
-        with:
-          cache-from: type=registry,ref=localhost:5000/${{ env.REPONAME }}/${{ matrix.source }}
-          cache-to: type=inline
-          context: contrib/${{ env.REPONAME }}image/${{ matrix.source }}
-          file: ./contrib/${{ env.REPONAME }}image/${{ matrix.source }}/Dockerfile
-          platforms: ${{ env.PLATFORMS }}
-          push: true
-          tags: ${{ steps.reponame_reg.outputs.fqin }}
-          labels: |
-            ${{ env.LABELS }}
-
-      # Push to $CONTAINERS_QUAY_REGISTRY only stable
-      - name: Login to ${{ env.CONTAINERS_QUAY_REGISTRY }}
-        if: steps.containers_reg.outputs.push == 'true'
-        uses: docker/login-action@dd4fa0671be5250ee6f50aedf4cb05514abda2c7 # v1
-        with:
-          registry: ${{ env.CONTAINERS_QUAY_REGISTRY}}
-          username: ${{ secrets.CONTAINERS_QUAY_USERNAME }}
-          password: ${{ secrets.CONTAINERS_QUAY_PASSWORD }}
-
-      - name: Push images to ${{ steps.containers_reg.outputs.fqin }}
-        if: steps.containers_reg.outputs.push == 'true'
-        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a # v2
-        with:
-          cache-from: type=registry,ref=localhost:5000/${{ env.REPONAME }}/${{ matrix.source }}
-          cache-to: type=inline
-          context: contrib/${{ env.REPONAME }}image/${{ matrix.source }}
-          file: ./contrib/${{ env.REPONAME }}image/${{ matrix.source }}/Dockerfile
-          platforms: ${{ env.PLATFORMS }}
-          push: true
-          tags: ${{ steps.containers_reg.outputs.fqin }}
-          labels: |
-            ${{ env.LABELS }}