Separate cache images to a cache package

.github/actions/build/action.yml

@@ -32,6 +32,7 @@ runs:
       shell: bash
       run: |
         echo "tags=$(bin/images --json | jq -c '.images[] | select(.version == "${{ inputs.version }}" and .context == "${{ inputs.context }}") | .tags_with_repository')" >> $GITHUB_OUTPUT
+        echo "cache=$(bin/images --json | jq -c '.images[] | select(.version == "${{ inputs.version }}" and .context == "${{ inputs.context }}") | .cache')" >> $GITHUB_OUTPUT
 
     - name: Build & push images
       uses: docker/build-push-action@master
@@ -40,5 +41,5 @@ runs:
         push: ${{ github.ref == 'refs/heads/master' }}
         tags: ${{ join(fromJSON(steps.data.outputs.tags), ', ') }}
         context: images/${{ inputs.version }}/${{ inputs.context }}
-        cache-from: type=registry,ref=${{ fromJSON(steps.data.outputs.tags)[0] }}-cache
-        cache-to: type=registry,ref=${{ fromJSON(steps.data.outputs.tags)[0] }}-cache,mode=max
+        cache-from: type=registry,ref=${{ fromJSON(steps.data.outputs.cache) }}
+        cache-to: type=registry,ref=${{ fromJSON(steps.data.outputs.cache) }},mode=max

.github/workflows/ci.yml

@@ -50,7 +50,13 @@ jobs:
     if: ${{ always() }}
     runs-on: ubuntu-latest
     steps:
-      - uses: dataaxiom/ghcr-cleanup-action@main
+      - name: Clean emacs untagged images
+        uses: dataaxiom/ghcr-cleanup-action@main
         with:
           package: emacs
           token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Clean emacs-cache untagged images
+        uses: dataaxiom/ghcr-cleanup-action@main
+        with:
+          package: emacs-cache
+          token: ${{ secrets.GITHUB_TOKEN }}

bin/images

@@ -102,6 +102,7 @@ class Image
       directory: directory,
       tags: tags,
       tags_with_repository: tags_with_repository,
+      cache: cache,
       depends: depends,
       depends_with_repository: depends_with_repository,
       children: children
@@ -124,6 +125,10 @@ class Image
     end.flatten
   end
 
+  def cache
+    tags_with_repository.first.sub('emacs:', 'emacs-cache:')
+  end
+
   def depends
     tags[0].split('-')[0..-2].join('-')
   end