build: build/push GitHub image to ghcr.io

.github/workflows/build.yml

@@ -25,7 +25,43 @@ jobs:
       - run: >
           sudo apt -qy update;
           sudo apt -qy install libavahi-compat-libdnssd-dev libjpeg-turbo-progs optipng gifsicle
-        if: ${{ matrix.os == 'ubuntu-latest' }}
+        if: matrix.os == 'ubuntu-latest'
       - run: npm install -g grunt-cli bower
       - run: npm install        # this also includes "grunt dist"
       - run: npm test
+  docker:
+    needs: build
+    if: github.ref == 'refs/heads/master' || contains('refs/tags/v', github.ref)
+    runs-on: ubuntu-latest
+    name: Build Docker images
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/setup-qemu-action@v1
+      - uses: docker/setup-buildx-action@v1
+      - name: compute Docker tag name
+        id: tagname
+        run: |
+          case ${GITHUB_REF} in
+            refs/tags/v*)
+              echo ::set-output name=tag::${GITHUB_REF#refs/tags/v}
+              ;;
+            refs/heads/master)
+              echo ::set-output name=tag::latest
+              ;;
+            *)
+              echo ::set-output name=tag::${GITHUB_SHA}
+              ;;
+          esac
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.CR_PAT }}
+      - uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: Dockerfile
+          platforms: linux/amd64 # ,linux/arm64: not working due to optipng vendoring
+          push: true
+          tags: |
+            ghcr.io/vincentbernat/dashkiosk:${{ steps.tagname.outputs.tag }}

README.md

@@ -58,20 +58,22 @@ in the `gh-pages` branch of this repository. To update it:
 
 # Docker
 
-There is a `Dockerfile` to run *Dashkiosk* inside Docker. As of [06438d6](https://github.com/dersimn/dashkiosk/commit/06438d6613107de5f6069266a51098ece3c62e45) this will also work with Chromecast devices if your Docker host supports the `--net=host` option:
+There is a `Dockerfile` to run *Dashkiosk* inside Docker. This will
+also work with Chromecast devices if your Docker host supports the
+`--net=host` option:
 
     $ docker run --net=host \
                  -v /var/lib/dashkiosk/database:/database \
                  -e "chromecast__enabled=1" \
                  -e "chromecast__receiver=http://<DOCKER_HOST_IP>:8081/receiver" \
                  -e "port=8081" \
-                 vincentbernat/dashkiosk:latest
+                 ghcr.io/vincentbernat/dashkiosk:latest
 
 To start without Chromecast support, simply run:
 
     $ docker run -d -p 8080:8080 \
                  -v /var/lib/dashkiosk/database:/database \
-                 vincentbernat/dashkiosk:latest
+                 ghcr.io/vincentbernat/dashkiosk:latest
 
 Using `latest` can be broken from time to time. You may prefer a
-stable tag, like `2.6.1`.
+stable tag, like `2.7.9`.

docs/install.rst

@@ -9,7 +9,22 @@ which URL to display.
 Server and receiver
 -------------------
 
-To install it, you need to execute the following step:
+The simpler way to get *Dashkiosk* is to use the Docker image::
+
+    $ docker run -d -p 8080:8080 \
+                 -v /var/lib/dashkiosk/database:/database \
+                 ghcr.io/vincentbernat/dashkiosk:latest
+
+If you need Chromecast support, you need to use ``--net=host``::
+
+    $ docker run --net=host \
+                 -v /var/lib/dashkiosk/database:/database \
+                 -e "chromecast__enabled=1" \
+                 -e "chromecast__receiver=http://<DOCKER_HOST_IP>:8081/receiver" \
+                 -e "port=8081" \
+                 ghcr.io/vincentbernat/dashkiosk:latest
+
+Alternatively, you need to execute the following step:
 
   1. Grab the latest `tarball for Dashkiosk`_ from GitHub.