WIP: use GH action to generate docs

Author: jenschude

.github/workflows/docs.yml

@@ -0,0 +1,37 @@
+name: Build and deploy docs
+on:
+  push:
+    branches:
+      - master
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v2
+        with:
+          persist-credentials: false
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.1
+          coverage: none
+
+      - name: Install and Build 🔧
+        run: ./install-apigen.sh && php apigen.phar generate --debug --config build/apigen.neon;
+
+      - name: Install SSH Client 🔑
+        uses: webfactory/[email protected]
+        with:
+          ssh-private-key: ${{ secrets.DEPLOY_KEY }}
+
+      - name: Deploy 🚀
+        uses: JamesIves/github-pages-deploy-action@releases/v3
+        with:
+          BASE_BRANCH: master
+          BRANCH: gh-pages
+          FOLDER: build/docs
+          CLEAN: true
+          SSH: true