chore: testing splitting job across runners

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

.github/workflows/build_container.yaml

@@ -16,6 +16,8 @@ on:
 env:
   GO_VERSION: "~1.22"
   IMAGE_NAME: "k8sgpt"
+  REGISTRY_IMAGE: ghcr.io/k8sgpt-ai/k8sgpt
+
 defaults:
   run:
     shell: bash
@@ -54,26 +56,89 @@ jobs:
           NON_FORKED_AND_NON_ROBOT_RUN=${{ ( github.actor != 'renovate[bot]' && github.actor != 'dependabot[bot]' ) && ( github.event_name == 'push' || github.event.pull_request.head.repo.full_name == github.repository ) }}
           echo "NON_FORKED_AND_NON_ROBOT_RUN=$NON_FORKED_AND_NON_ROBOT_RUN" >> "$GITHUB_OUTPUT"
 
-  upload_images:
-    name: Upload images to ghcr registry
+  build:
+    name: Build for ${{ matrix.platform }}
     needs: prepare_ci_run
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        image:
-          - name: k8sgpt
-            target: production
+        platform:
+          - linux/amd64
+          - linux/arm64
     env:
       DATETIME: ${{ needs.prepare_ci_run.outputs.DATETIME }}
       BUILD_TIME: ${{ needs.prepare_ci_run.outputs.BUILD_TIME }}
       GIT_SHA: ${{ needs.prepare_ci_run.outputs.GIT_SHA }}
-    permissions:
-      packages: write
-      contents: read
     steps:
       - name: Check out code
         uses: actions/checkout@v4
 
+      - name: Set env pair
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./container/Dockerfile
+          platforms: ${{ matrix.platform }}
+          target: production
+          build-args: |
+            GIT_HASH=${{ env.GIT_SHA }}
+            RELEASE_VERSION=dev-${{ env.DATETIME }}
+            BUILD_TIME=${{ env.BUILD_TIME }}
+          tags: ${{ env.REGISTRY_IMAGE }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: type=image,push-by-digest=true,name-canonical=true,push=true
+
+      - name: Export digest
+        run: |
+          mkdir -p ${{ runner.temp }}/digests
+          echo "${{ steps.build.outputs.digest }}" > "${{ runner.temp }}/digests/${{ env.PLATFORM_PAIR }}.digest"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: ${{ runner.temp }}/digests/*
+          retention-days: 1
+
+  merge:
+    name: Create and Push Manifest List
+    needs: build
+   # if: github.event_name == 'push' && needs.prepare_ci_run.outputs.NON_FORKED_AND_NON_ROBOT_RUN == 'true'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: ${{ runner.temp }}/digests
+          pattern: digests-*
+          merge-multiple: true
+
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:
@@ -82,23 +147,21 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up Docker Buildx
-        id: buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
         with:
-          context: .
-          file: ./container/Dockerfile
-          platforms: linux/arm64
-          target: ${{ matrix.image.target }}
+          images: ${{ env.REGISTRY_IMAGE }}
           tags: |
-            ghcr.io/k8sgpt-ai/${{ matrix.image.name }}:dev-${{ env.DATETIME }}
-          build-args: |
-            GIT_HASH=${{ env.GIT_SHA }}
-            RELEASE_VERSION=dev-${{ env.DATETIME }}
-            BUILD_TIME=${{ env.BUILD_TIME }}
-          builder: ${{ steps.buildx.outputs.name }}
-          push: true
-          cache-from: type=gha,scope=${{ github.ref_name }}-${{ matrix.image.name }}
-          cache-to: type=gha,scope=${{ github.ref_name }}-${{ matrix.image.name }}
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=dev-${{ needs.prepare_ci_run.outputs.DATETIME }}
+
+      - name: Create manifest list and push
+        working-directory: ${{ runner.temp }}/digests
+        run: |
+          digests=$(printf "${{ env.REGISTRY_IMAGE }}@%s " $(cat *.*_