Enable new DL-Cache in Workflow

.github/workflows/build.yml

@@ -61,8 +61,11 @@ jobs:
         id: imagename
         run: |
           IMG="${GITHUB_REPOSITORY,,}/base"
+          DLIMG="${GITHUB_REPOSITORY,,}/dl_cache"
           echo "name=ghcr.io/${IMG/ /-}" >> $GITHUB_OUTPUT
           echo "rawname=${IMG/ /-}" >> $GITHUB_OUTPUT
+          echo "dlname=ghcr.io/${DLIMG/ /-}" >> $GITHUB_OUTPUT
+          echo "dlrawname=${DLIMG/ /-}" >> $GITHUB_OUTPUT
       - name: Stop Commands
         run: T="$(echo -n ${{ github.token }} | sha256sum | head -c 64)" && echo -e "::add-mask::${T}\n::stop-commands::${T}"
       - name: Build target base image
@@ -74,6 +77,18 @@ jobs:
           tags: ${{ steps.imagename.outputs.name }}:latest
           cache-to: type=registry,mode=max,ref=${{ steps.imagename.outputs.name }}:cache
           cache-from: type=registry,ref=${{ steps.imagename.outputs.name }}:cache
+      - name: Generate download cache Dockerfile
+        run: ./generate.sh dl only
+      - name: Build download cache image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: Dockerfile.dl
+          pull: true
+          push: true
+          tags: ${{ steps.imagename.outputs.dlname }}:latest
+          cache-to: type=registry,mode=max,ref=${{ steps.imagename.outputs.dlname }}:cache
+          cache-from: type=registry,ref=${{ steps.imagename.outputs.dlname }}:cache
       - name: Cleanup
         if: ${{ env.HAVE_CLEANUP_PAT == 'true' }}
         continue-on-error: true
@@ -85,6 +100,17 @@ jobs:
           repository: ${{ github.repository }}
           owner_type: user
           untagged_only: true
+      - name: Cleanup Download Cache
+        if: ${{ env.HAVE_CLEANUP_PAT == 'true' }}
+        continue-on-error: true
+        uses: BtbN/delete-untagged-ghcr-action@main
+        with:
+          token: ${{ secrets.CLEANUP_PAT }}
+          package_name: ${{ steps.imagename.outputs.dlrawname }}
+          repository_owner: ${{ github.repository_owner }}
+          repository: ${{ github.repository }}
+          owner_type: user
+          untagged_only: true
   build_target_bases:
     name: Build target base image
     if: ${{ github.event.inputs.buildOnly != 'true' }}