Add Docker Hub README sync workflow

Author: GeiserX

.github/workflows/dockerhub-description.yml

@@ -0,0 +1,19 @@
+name: Docker Hub Description
+
+on:
+  push:
+    branches: [main]
+    paths: [README.md]
+  workflow_dispatch:
+
+jobs:
+  update-description:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: peter-evans/dockerhub-description@v4
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          repository: drumsergio/website-diff