GitHub Actions for doc (#12353)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/doc.yml

@@ -0,0 +1,50 @@
+name: doc
+
+on:
+  push:
+    branches:
+      - 'master'
+    paths:
+      - '.github/workflows/doc.yml'
+      - 'doc/**'
+      - 'mkdocs.yml'
+  pull_request:
+    branches:
+      - 'master'
+    paths:
+      - '.github/workflows/doc.yml'
+      - 'doc/**'
+      - 'mkdocs.yml'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      -
+        name: Build mkdocs Docker image
+        run: |
+          docker build -t mkdocs -f ./doc/Dockerfile ./
+      -
+        name: Build docs
+        run: |
+          docker run --rm -v "$(pwd):/docs" mkdocs build --strict
+          sudo chown -R $(id -u):$(id -g) ./out
+      -
+        name: Check GitHub Pages status
+        uses: crazy-max/ghaction-github-status@v2
+        with:
+          pages_threshold: major_outage
+      -
+        name: Deploy
+        if: github.event_name != 'pull_request' && endsWith(github.ref, github.event.repository.default_branch)
+        uses: crazy-max/ghaction-github-pages@v2
+        with:
+          target_branch: gh-pages
+          build_dir: out
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

doc/Dockerfile

@@ -0,0 +1,16 @@
+FROM squidfunk/mkdocs-material:6.1.0
+
+RUN \
+  apk add --no-cache \
+    git \
+    git-fast-import \
+    openssh \
+  && apk add --no-cache --virtual .build gcc musl-dev \
+  && pip install --no-cache-dir \
+    'markdown-include' \
+    'mkdocs-awesome-pages-plugin' \
+    'mkdocs-exclude' \
+    'mkdocs-git-revision-date-localized-plugin' \
+    'mkdocs-macros-plugin' \
+  && apk del .build gcc musl-dev \
+  && rm -rf /tmp/*

mkdocs.yml

@@ -29,7 +29,9 @@ plugins:
       j2_variable_end_string: '=@'
   - search
   - exclude:
-      glob: General/Changelogs/*
+      glob:
+        - "General/Changelogs/*"
+        - "Dockerfile"
 extra_css:
     - https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css
     - librenms.css