Build documentation in Github action

.github/workflows/documentation.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: Documentation build
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+
+      - name: Sphinx Build
+        # You may pin to the exact commit or the version.
+        # uses: ammaraskar/sphinx-action@8b4f60114d7fd1faeba1a712269168508d4750d2
+        uses: ammaraskar/sphinx-action@0.4
+        with:
+          # The folder containing your sphinx docs.
+          docs-folder: doc/
+          # The command used to build your documentation.
+          build-command: make html