add docker cache workflow

.forgejo/workflows/publish-docker-cache.yml

@@ -0,0 +1,44 @@
+#
+# This workflow caches yarn packages inside Docker
+#
+name: Publish Docker (docker cache)
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-22.04
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+      id-token: write
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Log in to registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.vault48.org
+          username: ${{ secrets.username }}
+          password: ${{ secrets.password }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: git.vault48.org/${{ env.GITHUB_REPOSITORY }}
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./ci/docker-cache/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.forgejo/workflows/publish-runner-cache.yml

@@ -1,8 +1,11 @@
-name: Publish Docker image
+#
+# This workflow caches yarn packages on runner
+#
+name: Publish Docker (runner cache)
 
 on:
   push:
-    branches: main
+    branches: [never]
 
 jobs:
   push_to_registry:
@@ -51,7 +54,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          file: ./ci/Dockerfile
+          file: ./ci/runner-cache/Dockerfile
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}