ci(docs): add workflow for building development docs

.github/workflows/docs.yaml

@@ -0,0 +1,27 @@
+name: Build development docs
+
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - "docs/**"
+
+jobs:
+  deploy:
+    name: Build and publish documentation
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Install Task
+        uses: arduino/setup-task@v1
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.x
+      - name: Prepare required Python packages
+        run: task docs:requirements
+      - name: Build and deploy documentation
+        run: task docs:deploy-dev