Update docker hub description

Author: johnsimons

.github/workflows/push-container-images.yml

@@ -52,4 +52,5 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
           repository: particular/servicepulse
-          readme-filepath: ./Container-README.md
+          readme-filepath: ./Container-README.md
+          short-description: Keep track of the health and performance of your system's endpoints, with minimal configuration.