Add pre-build stage

.github/workflows/pre-build.yml

@@ -0,0 +1,32 @@
+name: pre-build
+
+# Run this workflow every time a new commit pushed to your repository
+on: push
+
+jobs:
+  # Set the job key. The key is displayed as the job name
+  # when a job name is not provided
+  pre-build:
+    # Name the Job
+    name: Pre-Build
+    # Set the type of machine to run on
+    runs-on: ubuntu-latest
+
+    steps:
+      # Checks out a copy of your repository on the ubuntu-latest machine
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.8'
+      # Runs the Super-Linter action
+      - name: Style check
+        run: |
+          pip install flake8
+          python setup.py style 
+      - name: Build Docs
+        run: |
+          cd doc
+          python -m pip install -r requirements.txt
+          make html SPHINXOPTS='-W -v'
+