ci: Enable static-tarball build for riscv64

Enable `kernel` and `virtiofsd` static-tarball build for riscv64. Since
`virtiofsd` was previously supported and `kernel` is supported now.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

.github/workflows/build-kata-static-tarball-riscv64.yaml

@@ -0,0 +1,79 @@
+name: CI | Build kata-static tarball for riscv64
+on:
+  workflow_call:
+    inputs:
+      stage:
+        required: false
+        type: string
+        default: test
+      tarball-suffix:
+        required: false
+        type: string
+      push-to-registry:
+        required: false
+        type: string
+        default: no
+      commit-hash:
+        required: false
+        type: string
+      target-branch:
+        required: false
+        type: string
+        default: ""
+
+jobs:
+  build-asset:
+    runs-on: riscv-builder
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+      attestations: write
+    strategy:
+      matrix:
+        asset:
+          - kernel
+          - virtiofsd
+    steps:
+      - name: Login to Kata Containers quay.io
+        if: ${{ inputs.push-to-registry == 'yes' }}
+        uses: docker/login-action@v3
+        with:
+          registry: quay.io
+          username: ${{ secrets.QUAY_DEPLOYER_USERNAME }}
+          password: ${{ secrets.QUAY_DEPLOYER_PASSWORD }}
+
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.commit-hash }}
+          fetch-depth: 0 # This is needed in order to keep the commit ids history
+
+      - name: Rebase atop of the latest target branch
+        run: |
+          ./tests/git-helper.sh "rebase-atop-of-the-latest-target-branch"
+        env:
+          TARGET_BRANCH: ${{ inputs.target-branch }}
+
+      - name: Build ${{ matrix.asset }}
+        run: |
+          make "${KATA_ASSET}-tarball"
+          build_dir=$(readlink -f build)
+          # store-artifact does not work with symlink
+          mkdir -p kata-build && cp "${build_dir}"/kata-static-"${KATA_ASSET}"*.tar.* kata-build/.
+        env:
+          KATA_ASSET: ${{ matrix.asset }}
+          TAR_OUTPUT: ${{ matrix.asset }}.tar.gz
+          PUSH_TO_REGISTRY: ${{ inputs.push-to-registry }}
+          ARTEFACT_REGISTRY: ghcr.io
+          ARTEFACT_REGISTRY_USERNAME: ${{ github.actor }}
+          ARTEFACT_REGISTRY_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
+          TARGET_BRANCH: ${{ inputs.target-branch }}
+          RELEASE: ${{ inputs.stage == 'release' && 'yes' || 'no' }}
+
+      - name: store-artifact ${{ matrix.asset }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: kata-artifacts-arm64-${{ matrix.asset }}${{ inputs.tarball-suffix }}
+          path: kata-build/kata-static-${{ matrix.asset }}.tar.xz
+          retention-days: 15
+          if-no-files-found: error