add docker cache workflow

.forgejo/workflows/publish.yml

@@ -1,57 +0,0 @@
-name: Publish Docker image
-
-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 }}
-
-      - run: npm i -g yarn
-      
-      - name: Get yarn cache directory path
-        id: yarn-cache-dir-path
-        run: echo "dir=$(yarn cache dir)" >> $GITHUB_OUTPUT
-
-      - uses: actions/cache@v4
-        id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
-        with:
-          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
-          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-yarn-
-
-      - run: yarn install --immutable && yarn build
-
-      - name: Build and push Docker image
-        id: push
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: ./ci/Dockerfile
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}