Add matrix strategy for Docker build runners

Author: larscom

.github/workflows/workflow.yml

@@ -39,8 +39,11 @@ jobs:
 
   build-docker:
     if: github.event_name != 'pull_request'
-    needs: [build-rs, build-ng]
-    runs-on: ubuntu-latest
+    needs: [build-rs, build-ng]  
+    strategy:
+      matrix:
+        runner: [ubuntu-latest, ubuntu-24.04-arm64]
+    runs-on: ${{ matrix.runner }}
     steps:
       - uses: actions/checkout@v6
       - run: |
@@ -52,6 +55,7 @@ jobs:
             REF_NAME_CLEAN="0$REF_NAME_CLEAN"
           fi          
           echo "CLEANED_REF_NAME=$REF_NAME_CLEAN" >> $GITHUB_ENV
+
       - uses: docker/setup-qemu-action@v3
       - uses: docker/setup-buildx-action@v3
       - uses: docker/login-action@v3
@@ -65,21 +69,20 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
           repository: ${{ github.repository }}
-          short-description: ${{ github.event.repository.description }}      
+          short-description: ${{ github.event.repository.description }}
+
       - uses: docker/build-push-action@v6
         if: startsWith(github.ref, 'refs/tags/')
         with:
           context: .
           push: true
-          platforms: linux/amd64,linux/arm64
           tags: ${{ github.repository }}:latest,${{ github.repository }}:${{ github.ref_name }}
           build-args: VERSION_ARG=v${{ github.ref_name }}
+
       - uses: docker/build-push-action@v6
         if: startsWith(github.ref, 'refs/heads/')
         with:
           context: .
           push: true
-          platforms: linux/amd64,linux/arm64
           tags: ${{ github.repository }}:${{ env.CLEANED_REF_NAME }}
           build-args: VERSION_ARG=${{ github.sha }}@${{ env.CLEANED_REF_NAME }}
-