Clean up GitHub Workflows (#3059)

* initial cleanup of github workflows

* only run pr-label workflow on push to master

* move docker ci/release summaries to scripts

* add XS label for PR's under 2 lines

* draft test job for Docker CI

* fix & activate Docker CI test job

* add debug step to docker CI

* fix Docker CI test container env

* Docker CI build matrix

* fixup build summaries

* fix pipes in summary

* optimize Dockerfile for layer caching

* more markdown escaping

* add gha cache scopes

* add Docker CI cache clean workflow

.github/workflows/documentation-release.yml

@@ -0,0 +1,37 @@
+name: Docs
+
+on:
+  push:
+    branches: [ stable ]
+    paths:
+      - 'docs/**'
+      - 'mkdocs.yml'
+      - '.github/workflows/documentation.yml'
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Python 3
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.x
+
+      - name: Set up workflow cache
+        uses: actions/cache@v3
+        with:
+          key: ${{ github.ref }}
+          path: .cache
+
+      - run: pip install mkdocs-material
+
+      - run: mkdocs gh-deploy --force