add layer caching, build args

.github/workflows/docker-publish.yml

@@ -15,6 +15,7 @@ concurrency:
 env:
   REGISTRY: ghcr.io
   IMAGE_NAME: ${{ github.repository }}
+  WRITEFREELY_VERSION: v0.15.0
 
 jobs:
   build:
@@ -37,13 +38,14 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Get metadata
-        id: meta
-        uses: docker/metadata-action@v5
+      - uses: actions/cache@v3
         with:
-          images: |
-            jrasanen/writefreely
-            ghcr.io/${{ github.repository }}
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
 
       - name: Build and Push
         uses: docker/build-push-action@v5
@@ -52,5 +54,11 @@ jobs:
           file: ./Dockerfile
           push: true
           labels: ${{ steps.meta.outputs.labels }}
-          tags: ${{ steps.meta.outputs.tags }}
+          build-args: |
+            WRITEFREELY_VERSION=${{ env.WRITEFREELY_VERSION }} 
+          tags: |
+            ${{ env.DOCKERHUB_REPO }}:${{ env.WRITEFREELY_VERSION }}
+            ${{ env.DOCKERHUB_REPO }}:latest
           platforms: linux/amd64,linux/arm64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max