build multiarch

.forgejo/workflows/container.yaml

@@ -13,6 +13,8 @@ env:
   BUILDKITD_FLAGS: --oci-worker-no-process-sandbox
   REGISTRY_URL: git.sb20.xengi.de
   REGISTRY_TAG: latest
+  # Platforms to build for: amd64 (NAS/test) + arm64 (RB5009)
+  PLATFORMS: linux/amd64,linux/arm64
 
 jobs:
   build:
@@ -25,7 +27,7 @@ jobs:
         run: |
           mkdir -p ~/.docker
           echo "{\"auths\":{\"${{ env.REGISTRY_URL }}\":{\"username\":\"${{ env.FORGEJO_REPOSITORY_OWNER }}\",\"password\":\"${{ secrets.REGISTRY_TOKEN }}\"}}}" > ~/.docker/config.json
-      - name: Build container
+      - name: Build and push multi-arch container
         run: |
           export CREATED=$(date -Iseconds)
           sed -i "s/%%CREATED%%/$CREATED/" Dockerfile
@@ -34,6 +36,7 @@ jobs:
             --frontend dockerfile.v0 \
             --local context=./ \
             --local dockerfile=./ \
+            --opt platform=${{ env.PLATFORMS }} \
             --output type=image,name=${{ env.REGISTRY_URL }}/${{ env.FORGEJO_REPOSITORY }}:${{ env.REGISTRY_TAG }},push=true
       - name: Send notification
         if: ${{ failure() }}