feat: test GHA build caching

.github/workflows/pull-request.yml

@@ -36,7 +36,8 @@ jobs:
         id: tag
         run: |
           git_hash=$(git rev-parse --short "$GITHUB_SHA")
-          image_tag="unraid/api-builder:$git_hash"
+          branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}
+          image_tag="unraid/api-builder:$branch"
           echo $image_tag
           echo "tag=$image_tag" >> "$GITHUB_OUTPUT"
       - uses: docker/setup-buildx-action@v1
@@ -50,6 +51,16 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           provenance: false
+      - name: Build
+        uses: docker/build-push-action@v4
+        with:
+          context: api
+          target: builder
+          push: false
+          tags: unraid-api:builder
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          provenance: false
 
   lint-api:
     needs: [build]
@@ -59,14 +70,21 @@ jobs:
         working-directory: api
     runs-on: ubuntu-latest
     steps:
-      - name: Download artifact
-        uses: actions/download-artifact@v3
+      - name: Checkout repo
+        uses: actions/checkout@v3
         with:
-          name: builder
-          path: /tmp
-      - name: Load image
-        run: |
-          docker load --input /tmp/builder.tar
+          persist-credentials: true
+      - uses: docker/setup-buildx-action@v1
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: api
+          target: builder
+          push: false
+          tags: unraid-api:builder
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          provenance: false
       - name: Lint
         run: |
           docker run unraid-api:builder npm run lint