add docker description sync

Author: dbpolito

.github/workflows/docker-description.yml

@@ -0,0 +1,22 @@
+name: Sync Docker Hub Description
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - README.md
+      - .github/workflows/docker-description.yml
+
+jobs:
+  docker-description:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Sync Docker Hub Description
+        uses: peter-evans/dockerhub-description@v2
+        env:
+          DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+          DOCKERHUB_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}
+          DOCKERHUB_REPOSITORY: kooldev/nginx