Add Gitea Actions workflow for MkDocs build

.gitea/workflows/mkdocs.yml

@@ -0,0 +1,27 @@
+name: MkDocs Build
+on:
+  push:
+    paths:
+      - '**.md'
+      - 'mkdocs.yml'
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.11'
+      - name: Install MkDocs Material
+        run: pip install mkdocs-material
+      - name: Build MkDocs
+        run: mkdocs build
+      - name: Commit build output
+        run: |
+          git config --global user.email "ci@example.com"
+          git config --global user.name "ci-bot"
+          git add site
+          git commit -m "Update MkDocs site"
+          git push