Add a command to clean all datatracker related docker resources (from nick@staff.ietf.org)

 - Legacy-Id: 19644

Author: rjsparks

docker/README.md

@@ -121,7 +121,7 @@ docker-compose down
 
 to terminate the containers.
 
-### Clean / Rebuild / Fetch Latest DB Image
+### Clean and Rebuild DB from latest image
 
 To delete the active DB container, its volume and get the latest image / DB dump, simply run the following command:
 
@@ -140,6 +140,24 @@ docker-compose pull db
 docker-compose build --no-cache db
 ```
 
+### Clean all
+
+To delete all containers for this project, its associated images and purge any remaining dangling images, simply run the following command:
+
+On Linux / macOS:
+
+```sh
+cd docker
+cleanall
+```
+
+On Windows:
+```sh
+cd docker
+docker-compose down -v --rmi all
+docker image prune 
+```
+
 ### Accessing MariaDB Port
 
 The port is exposed but not mapped to `3306` to avoid potential conflicts with the host. To get the mapped port, run the command *(from the project `/docker` directory)*:

docker/cleanall

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+echo "Shutting down any instance still running and purge images..."
+docker-compose down -v --rmi all
+echo "Purging dangling images..."
+docker image prune
+echo "Done!"