fixup! fixup! fixup! fixup! fixup! Cache Docker images on GitHub container registry

Author: TheAssassin

.github/workflows/main.yml

@@ -35,8 +35,6 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
       - name: Build AppImage in Docker
         run: bash -ex ci/build-in-docker.sh
-        env:
-          DOCKER_TAG: ${{ steps.meta.outputs.tags[0] }}
       - name: Archive artifacts
         uses: actions/upload-artifact@v4
         with:

ci/build-in-docker.sh

@@ -32,16 +32,16 @@ cwd="$PWD"
 repo_root="$(readlink -f "$(dirname "$0")"/..)"
 
 # use docker image tag provided by GitHub actions if possible
-DOCKER_TAG="${DOCKER_TAG:-ghcr.io/appimage/appimageupdate-build:local-build}"
+docker_tag="ghcr.io/appimagecommunity/appimageupdate-build:$(cut -d: -f2- <<<"${DOCKER_METADATA_OUTPUT_TAGS:-:local-build}")"
 
-default_branch_tag="$(echo "$DOCKER_TAG" | cut -d: -f1):$(echo "${GITHUB_DEFAULT_BRANCH:-main}" | rev | cut -d/ -f1 | rev)"
+default_branch_tag="$(cut -d: -f1 <<<"$docker_tag"):$(echo "${GITHUB_DEFAULT_BRANCH:-main}" | rev | cut -d/ -f1 | rev)"
 
 extra_build_args=()
 
 if [[ "${GITHUB_ACTIONS:-}" != "" ]]; then
     echo "Building on GitHub actions, pushing cache"
     extra_build_args+=(
-        --output "type=registry,ref=${DOCKER_TAG}"
+        --output "type=registry,ref=${docker_tag}"
         --push
     )
 else
@@ -51,10 +51,10 @@ fi
 # building local image to "cache" installed dependencies for subsequent builds
 docker buildx build \
     "${extra_build_args[@]}" \
-    --cache-from "type=registry,ref=${DOCKER_TAG}" \
+    --cache-from "type=registry,ref=${docker_tag}" \
     --cache-from "type=registry,ref=${default_branch_tag}" \
     --platform "$docker_platform" \
-    -t "$DOCKER_TAG" \
+    -t "$docker_tag" \
     --build-arg ARCH="$ARCH" \
     --build-arg CMAKE_ARCH="$CMAKE_ARCH" \
     "$repo_root"/ci
@@ -80,5 +80,5 @@ docker run \
     -v "$cwd":/out \
     -w /out \
     --user "$uid" \
-    "$DOCKER_TAG" \
+    "$docker_tag" \
     bash /ws/ci/build-appimages.sh