feat: add github workflow for build and release

.github/workflows/build-docker.yml

@@ -0,0 +1,61 @@
+name: container-images
+
+on:
+  push:
+    branches: [ "main" ]
+    tags: [ "v*" ]
+
+jobs:
+  build-container-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - uses: docker/setup-qemu-action@v3
+    - uses: docker/setup-buildx-action@v3
+
+    - name: Set ALL_TAGS
+      env:
+        REPOSITORY: '${{ github.repository }}'
+      run: |
+        # tag main if main branch
+        if [[ "${{ github.ref_name }}" == "main" ]]; then
+          image_tags=("main")
+        # tag with tag name if tag
+        elif [[ "${{ github.ref }}" == refs/tags/v* ]]; then
+          image_tags=("${{ github.ref_name }}")
+          # tag with latest if tag is a new major, minor or patch version
+          if [[ "${{ github.ref_name }}" =~ ^v(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)$ ]]; then
+            image_tags+=("latest")
+          fi
+        fi
+
+        lc_repo=${REPOSITORY,,}
+
+        image_paths=()
+        for tag in ${image_tags[@]}; do
+          image_paths+=("ghcr.io/$lc_repo:$tag")
+        done
+
+        # join with ',' and then skip first character
+        ALL_TAGS=$(printf ',%s' "${image_paths[@]}")
+        echo "ALL_TAGS=${ALL_TAGS:1}" >>$GITHUB_ENV
+
+    - name: Login to ghcr.io
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Build and push default image
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        platforms: linux/amd64,linux/arm64
+        push: true
+        tags: ${{ env.ALL_TAGS }}

.github/workflows/release.yml

@@ -0,0 +1,35 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Check if stable release
+        id: check
+        run: |
+          # align with build-docker.yml: stable only for strict semver tags
+          if [[ "${{ github.ref_name }}" =~ ^v(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)$ ]]; then
+            echo "stable=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "stable=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Create release
+        uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true
+          draft: false
+          prerelease: ${{ steps.check.outputs.stable != 'true' }}
+          make_latest: ${{ steps.check.outputs.stable == 'true' }}

README.md

@@ -64,6 +64,14 @@ todo-mcp purge
 
 ## Docker
 
+A pre-built image is available from GitHub Container Registry:
+
+```sh
+docker run --rm -v todo-mcp-data:/data -e TODO_DB=/data/todos.db ghcr.io/janezicmatej/todo-mcp --help
+```
+
+Or build locally:
+
 ```sh
 docker build -t local/todo-mcp .
 docker run --rm -v todo-mcp-data:/data -e TODO_DB=/data/todos.db local/todo-mcp --help
@@ -88,8 +96,6 @@ Data is persisted in the `todo-mcp-data` volume. See [Usage](#usage) for more co
 
 ### Docker
 
-Build the image first (see [Docker](#docker)), then add to your Claude MCP config:
-
 ```json
 {
   "mcpServers": {
@@ -99,7 +105,7 @@ Build the image first (see [Docker](#docker)), then add to your Claude MCP confi
         "run", "-i", "--rm",
         "-v", "todo-mcp-data:/data",
         "-e", "TODO_DB=/data/todos.db",
-        "local/todo-mcp", "mcp-serve"
+        "ghcr.io/janezicmatej/todo-mcp", "mcp-serve"
       ]
     }
   }