Force use of local gcc image for base

Author: Bronek

.github/workflows/debian.yml

@@ -19,6 +19,7 @@ defaults:
 env:
   CONTAINER_REGISTRY: ghcr.io
   BUILDKIT_PROGRESS: plain
+  LOCAL_GCC_IMAGE: localhost.localdomain/gcc
   CONAN_VERSION: 2.19.1
   GCOVR_VERSION: 8.3
   CMAKE_VERSION: 3.31.6
@@ -92,38 +93,22 @@ jobs:
           echo "CONTAINER_IMAGE=${CONTAINER_REGISTRY}/${CONTAINER_REPO}/debian-${{ matrix.os.release }}" >> $GITHUB_ENV
           PLATFORM=${{ matrix.architecture.platform }}
           echo "PLATFORM_PAIR=${PLATFORM//\//-}" >> $GITHUB_ENV
-      - name: Prepare gcc image metadata
-        if: ${{ matrix.os.release == 'bullseye' }}
-        id: meta-gcc
-        uses: docker/metadata-action@v5
-        env:
-          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,manifest-descriptor
-        with:
-          # NOTE, tag and image must match base of docker/debian/Dockerfile
-          images: gcc
-          tags: |
-            type=raw,value=${{ matrix.os.compiler_version }}-${{ matrix.os.release }}
-          labels: |
-            org.opencontainers.image.authors=For inquiries, please use https://${{ github.repository }}/issues
-            org.opencontainers.image.documentation=https://${{ github.repository }}
-            org.opencontainers.image.vendor=XRPLF
-            org.opencontainers.image.title=${{ env.CONTAINER_REPOSITORY }}-gcc
       - name: Build gcc image do not push
         if: ${{ matrix.os.release == 'bullseye' }}
+        id: build-gcc
         uses: docker/build-push-action@v6
         with:
           build-args: |
             BUILDKIT_DOCKERFILE_CHECK=skip=InvalidDefaultArgInFrom
             BUILDKIT_INLINE_CACHE=1
           context: .
           file: docker/debian/Dockerfile.gcc-${{ matrix.os.compiler_version }}-${{ matrix.os.release }}
-          outputs: type=image,name=gcc,push=false
+          outputs: type=image,name=${{ env.LOCAL_GCC_IMAGE }},push=false
           platforms: ${{ matrix.architecture.platform }}
           provenance: mode=max
           push: false
           sbom: true
-          labels: ${{ steps.meta-gcc.outputs.labels }}
-          tags: ${{ steps.meta-gcc.outputs.tags }}
+          tags: ${{ format('{0}:{1}-{2}', env.LOCAL_GCC_IMAGE, matrix.os.compiler_version, matrix.os.release) }}
       - name: Prepare container metadata
         id: meta
         uses: docker/metadata-action@v5
@@ -152,6 +137,7 @@ jobs:
             GCOVR_VERSION=${{ env.GCOVR_VERSION }}
             CMAKE_VERSION=${{ env.CMAKE_VERSION }}
             DEBIAN_VERSION=${{ matrix.os.release }}
+            BASE_IMAGE=${{ matrix.os.release == 'bullseye' && format('{0}@{1}', env.LOCAL_GCC_IMAGE, steps.build-gcc.outputs.digest) || format('gcc:{0}-{1}', matrix.os.compiler_version, matrix.os.release) }}
           context: .
           file: docker/debian/Dockerfile
           outputs: type=image,name=${{ env.CONTAINER_IMAGE }},push-by-digest=true,name-canonical=true,push=true

docker/debian/Dockerfile

@@ -8,7 +8,8 @@
 # image, even though it is not used for Clang.
 ARG DEBIAN_VERSION
 ARG GCC_VERSION=invalid
-FROM gcc:${GCC_VERSION}-${DEBIAN_VERSION} AS gcc-src
+ARG BASE_IMAGE=gcc:${GCC_VERSION}-${DEBIAN_VERSION}
+FROM ${BASE_IMAGE} AS gcc-src
 
 # ====================== BASE IMAGE ======================
 FROM debian:${DEBIAN_VERSION} AS base