Push Docker image to DockerHub

.github/workflows/docker.yml

@@ -0,0 +1,45 @@
+name: docker
+
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+    tags:
+      - v*
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Set TAG_NAME
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          echo "##[set-env name=TAG_NAME;]${GITHUB_REF#refs/tags/}"
+      -
+        name: Checkout
+        uses: actions/checkout@v1
+      -
+        name: Docker Build
+        run: |
+          docker build \
+            --build-arg "VERSION=${TAG_NAME}" \
+            --tag "crazymax/ghaction-github-pages:${TAG_NAME}" \
+            --tag "crazymax/ghaction-github-pages:latest" \
+            --file Dockerfile .
+      -
+        name: Docker Login
+        if: success() && startsWith(github.ref, 'refs/tags/v')
+        env:
+          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
+        run: |
+          echo "${DOCKER_PASSWORD}" | docker login --username ${DOCKER_USERNAME} --password-stdin
+      -
+        name: Docker Push
+        if: success() && startsWith(github.ref, 'refs/tags/v')
+        run: |
+          docker push crazymax/ghaction-github-pages

Dockerfile

@@ -1,13 +1,15 @@
 FROM alpine/git:latest
 
+ARG VERSION
+
 # https://help.github.com/en/articles/metadata-syntax-for-github-actions#about-yaml-syntax-for-github-actions
-LABEL version="0.1.0" \
+LABEL version="$VERSION" \
   repository="https://github.com/crazy-max/ghaction-github-pages" \
   homepage="https://github.com/crazy-max/ghaction-github-pages" \
   maintainer="CrazyMax" \
   "com.github.actions.name"="GitHub Pages" \
   "com.github.actions.description"="GitHub Action for deploying GitHub Pages" \
-  "com.github.actions.icon"="package" \
+  "com.github.actions.icon"="upload-cloud" \
   "com.github.actions.color"="green"
 
 COPY LICENSE README.md /

README.md

@@ -52,6 +52,19 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 ```
 
+Docker :whale: image is also provided and automatically updated within [Docker Hub](https://hub.docker.com/u/crazymax/ghaction-github-pages) so you can directly use the following [DockerHub action](https://help.github.com/en/articles/workflow-syntax-for-github-actions#example-using-a-docker-hub-action):
+
+```yaml
+- name: Deploy
+  if: success()
+  uses: docker://crazymax/ghaction-github-pages
+  with:
+    target_branch: gh-pages
+    build_dir: public
+  env:
+    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```
+
 ## 💅 Customizing
 
 ### inputs