ci: use gha cache and fix release-please triggers

.github/workflows/ci.yml

@@ -126,26 +126,24 @@ jobs:
       - ruby
       - openapi
       - frontend
+    if: github.event_name != 'pull_request' || !startsWith(github.head_ref, 'release-please--')
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-
+      - uses: docker/setup-buildx-action@v4
       - name: Build Docker smoke image
-        run: docker build -t html2rss/web -f Dockerfile .
-
-      - name: Export Docker smoke image
-        run: docker save html2rss/web -o /tmp/html2rss-web-smoke-image.tar
-
-      - name: Upload Docker smoke image
-        uses: actions/upload-artifact@v7
+        uses: docker/build-push-action@v7
         with:
-          name: docker-smoke-image
-          path: /tmp/html2rss-web-smoke-image.tar
-          retention-days: 1
+          context: .
+          load: true
+          tags: html2rss/web
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
 
   docker-test:
     needs:
       - docker-build-smoke-image
+    if: github.event_name != 'pull_request' || !startsWith(github.head_ref, 'release-please--')
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -158,14 +156,15 @@ jobs:
         with:
           bundler-cache: true
 
-      - name: Download Docker smoke image
-        uses: actions/download-artifact@v8
-        with:
-          name: docker-smoke-image
-          path: /tmp
+      - uses: docker/setup-buildx-action@v4
 
-      - name: Load Docker smoke image
-        run: docker load -i /tmp/html2rss-web-smoke-image.tar
+      - name: Load Docker smoke image from cache
+        uses: docker/build-push-action@v7
+        with:
+          context: .
+          load: true
+          tags: html2rss/web
+          cache-from: type=gha
 
       - name: Run Docker smoke test
         env:

.github/workflows/release.yml

@@ -154,14 +154,6 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
-      - name: Cache Docker layers
-        uses: actions/cache@v4
-        with:
-          path: /tmp/.buildx-cache
-          key: ${{ runner.os }}-buildx-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-buildx-
-
       - name: Build and push Docker image
         uses: docker/build-push-action@v7
         env:
@@ -174,8 +166,8 @@ jobs:
             BUILD_TAG=${{ env.RELEASE_VERSION }}
             GIT_SHA=${{ needs.guard.outputs.target_sha }}
           platforms: linux/amd64,linux/arm64
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache-new
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           provenance: true
           sbom: true
           labels: |
@@ -188,11 +180,6 @@ jobs:
             org.opencontainers.image.url=https://github.com/${{ github.repository }}/releases/tag/${{ env.RELEASE_TAG }}
             org.opencontainers.image.version=${{ env.RELEASE_VERSION }}
 
-      - name: Move updated cache into place
-        run: |
-          rm -rf /tmp/.buildx-cache
-          mv /tmp/.buildx-cache-new /tmp/.buildx-cache
-
       - name: Summarize published image tags
         run: |
           {