Enable PR preview

.github/workflows/ci.yml

@@ -23,18 +23,3 @@ jobs:
         uses: actions/upload-pages-artifact@v1
         with:
           path: ./site/
-  deploy:
-    if: github.event.repository.fork == false
-    needs: build
-    permissions:
-      pages: write
-      id-token: write
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: ubuntu-latest
-    steps:
-      - name: Deploy to GitHub Pages
-        id: deployment
-        uses: actions/deploy-pages@v1
-

.github/workflows/gh-pages.yml

@@ -0,0 +1,28 @@
+on:
+  push:
+    branches: ["gh-pages"]
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Allow one concurrent deployment
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    if: github.event.repository.fork == false
+    needs: build
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v1
+
+

.github/workflows/preview.yml

@@ -0,0 +1,26 @@
+name: Deploy PR previews
+
+on:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - closed
+
+concurrency: preview-${{ github.ref }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.x
+      - run: pip install mkdocs-material mkdocs-git-revision-date-localized-plugin
+      - run: mkdocs build
+      - name: Deploy preview
+        uses: rossjrw/pr-preview-action@v1
+        with:
+          source-dir: ./site/