added tests for docs

.github/workflows/docs-test.yml

@@ -0,0 +1,16 @@
+---
+name: Test
+on:
+  push:
+    branches:
+      - "*"
+      - "!releases/**"
+    paths:
+      - "docs/**"
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: docker run -v $(pwd):/docs --entrypoint mkdocs squidfunk/mkdocs-material:6.1.5 build --clean --strict --site-dir /tmp/mkdocs-test