Merge pull request #161 from ccb-hms/feature/rocker-base

docker prune during build to free disk space

.github/workflows/container.yml

@@ -41,7 +41,7 @@ jobs:
         sudo swapoff -a
         sudo rm -f /swapfile
         sudo apt clean
-        docker rmi $(docker image ls -aq)
+        docker system prune
         df -h
 
     - name: cleanup old action artifacts