add workflow to update Docker hub repo description

.github/workflows/update_docker_readme.yml

@@ -0,0 +1,23 @@
+name: Update Docker Hub Description
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - README.md
+  workflow_dispatch:
+
+jobs:
+  dockerHubDescription:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Docker Hub Description
+      uses: peter-evans/dockerhub-description@v4
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_TOKEN }}
+        repository: jcpd/docker-dotclear
+        short-description: ${{ github.event.repository.description }}
+        enable-url-completion: true