Add deploy-docs.yml workflow

.github/workflows/deploy-docs.yml

@@ -0,0 +1,38 @@
+name: Deploy docs
+on:
+  push:
+    branches:
+      - master
+      - main
+    paths:
+      - '.github/workflows/deploy-docs.yml'
+      - 'pyproject.toml'
+      - 'poetry.lock'
+      - 'mkdocs.yml'
+      - 'docs/*'
+      - 'async-tkinter-loop/*'
+
+permissions:
+  contents: write
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install poetry
+        run: pipx install poetry
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.x
+          cache: "poetry"
+          cache-dependency-path: poetry.lock
+
+      - name: Install dependencies
+        run: poetry install --no-root --group=docs
+
+      - name: Deploy docs
+        run: poetry run mkdocs gh-deploy --force