Add GH workflow to build docs

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@foundries.io>

Author: mwasilew

.github/workflows/docs.yml

@@ -0,0 +1,32 @@
+name: Build docs
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.7]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+
+      - name: Install deps
+        run: |
+         python -m pip install --upgrade pip setuptools
+         pip install mkdocs
+         pip install -r mkdocs_plugin/requirements.txt
+
+      - name: Install current plugin
+        run: |
+         python mkdocs_plugin/setup.py install --force
+         pip freeze
+
+      - name: Build docs
+        run: |
+         python -m mkdocs build --clean --site-dir html --config-file mkdocs.yml