Minor updates

Update to include both options to use image from hub or build locally

Author: mkmurali

README.md

@@ -63,10 +63,21 @@ The following Environment Variables are available to configure the Proxy service
 | `DB_PASSWORD`                 | `NULL`              | MySQL Database Server Password            |
 | `DB_DATABASE`                 | `NULL`              | MySQL Database Name                       |
 
-### Docker Build
+### Docker Image
 
+#### Use pre-built docker image
+Use docker image from Docker hub
 ```bash
-#Build local docker image
+# Run using pre-build docker image
+# Prepare environment variables in .env file
+docker run -d -p 3000:3000 --env-file ./.env --name auth-proxy softrams/prefect-auth-proxy:latest
+```
+
+#### Build a local docker image
+Build a local docker image (with any changes as needed) and publish to your own repository.
+
+```bash
+# Build local docker image
 docker build -t prefect-auth-proxy .
 # Run docker image
 # Prepare environment variables in .env file