ci: add mkdocs builder

Author: LordOfPolls

.github/workflows/docs.yml

@@ -0,0 +1,26 @@
+name: docs-builder
+on:
+  push:
+    branches:
+      - stable
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    if: github.event.repository.fork == false
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+      - uses: actions/cache@v3
+        with:
+          key: ${{ github.ref }}
+          path: .cache
+      - run: pip install -e .[docs]
+      - run: pip install git+https://${GH_TOKEN}@github.com/squidfunk/mkdocs-material-insiders.git
+      - run: mkdocs gh-deploy
+env:
+  GH_TOKEN: ${{ secrets.GH_TOKEN }}
+  DEPLOY: True