Add warning about cleaning up sing images to config.yaml

config/config.yaml

@@ -10,6 +10,9 @@ container_framework: docker
 # Only used if container_framework is set to singularity, this will unpack the singularity containers
 # to the local filesystem. This is useful when PRM containers need to run inside another container,
 # such as would be the case in an HTCondor/OSPool environment.
+# NOTE: This unpacks singularity containers to the local filesystem, which will take up space in a way
+# that persists after the workflow is complete. To clean up the unpacked containers, the user must
+# manually delete them.
 unpack_singularity: false
 
 # Allow the user to configure which container registry containers should be pulled from