chore: support github action to push to docker.io

.github/workflows/docker-publish.yml

@@ -0,0 +1,93 @@
+name: Publish Docker image
+
+on:
+  push:
+    branches: [ "main" ]
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    name: Build and push image
+    runs-on: ubuntu-latest
+    concurrency:
+      group: docker-${{ github.ref }}
+      cancel-in-progress: false
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU (for multi-arch builds)
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Cache Docker layers
+        uses: actions/cache@v4
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ hashFiles('Dockerfile', 'pubspec.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      # Docker Hub login (active)
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          registry: docker.io
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      # GHCR login (commented out for future usage)
+      # - name: Log in to GitHub Container Registry
+      #   uses: docker/login-action@v3
+      #   with:
+      #     registry: ghcr.io
+      #     username: ${{ github.actor }}
+      #     password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+          flavor: |
+            latest=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+
+      - name: Move cache
+        if: always()
+        run: |
+          if [ -d /tmp/.buildx-cache-new ]; then
+            rm -rf /tmp/.buildx-cache
+            mv /tmp/.buildx-cache-new /tmp/.buildx-cache
+          else
+            echo "No new cache to move"
+          fi

.gitignore

@@ -125,6 +125,7 @@ devtools_options.yaml
 test/features/*_test.dart
 **/app_localizations*.dart
 .env
+.secrets
 docs/wireframe.assets/*.excalidraw.svg
 docs/wireframe.assets/*.svg
 docs/wireframe.assets/*.png

README.md

@@ -57,6 +57,8 @@ docker build -t pdf_signature .
 
 # Run the container (serves static files on port 8080)
 docker run --rm -p 8080:8080 pdf_signature
+
+# act push -P ubuntu-latest=catthehacker/ubuntu:act-latest --container-options "--privileged" --env-file .env --secret-file .secrets
 ```
 Access your app at [http://localhost:8080](http://localhost:8080)