Changes the intermediate image building steps to use registry caching, allowig us to always rebuild them, but do so very quickly when nothing has changed

.github/workflows/reusable-workflow-builder.yml

@@ -23,6 +23,9 @@ jobs:
     name: Build ${{ fromJSON(inputs.build-json).name }} @ ${{ fromJSON(inputs.build-json).version }}
     runs-on: ubuntu-latest
     steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
       -
         name: Login to Github Container Registry
         uses: docker/login-action@v1
@@ -30,33 +33,15 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      -
-        name: Determine if build needed
-        id: build-skip-check
-        run: |
-          if ! docker manifest inspect ${{ fromJSON(inputs.build-json).image_tag }} &> /dev/null ; then
-            echo "Building, no image exists with this version"
-            echo ::set-output name=image-exists::false
-          else
-            echo "Not building, image exists with this version"
-            echo ::set-output name=image-exists::true
-          fi
-      -
-        name: Checkout
-        uses: actions/checkout@v3
-        if: ${{ steps.build-skip-check.outputs.image-exists == 'false' }}
       -
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
-        if: ${{ steps.build-skip-check.outputs.image-exists == 'false' }}
       -
         name: Set up QEMU
         uses: docker/setup-qemu-action@v1
-        if: ${{ steps.build-skip-check.outputs.image-exists == 'false' }}
       -
         name: Build ${{ fromJSON(inputs.build-json).name }}
         uses: docker/build-push-action@v2
-        if: ${{ steps.build-skip-check.outputs.image-exists == 'false' }}
         with:
           context: .
           file: ${{ inputs.dockerfile }}
@@ -64,5 +49,5 @@ jobs:
           platforms: linux/amd64,linux/arm64,linux/arm/v7
           build-args: ${{ inputs.build-args }}
           push: true
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          cache-from: type=registry,ref=${{ fromJSON(inputs.build-json).cache_tag }}
+          cache-to: type=registry,mode=max,ref=${{ fromJSON(inputs.build-json).cache_tag }}