fixed whitespace, expanded README

Author: o-smirnov

README.md

@@ -49,3 +49,14 @@ This makes the ``build-cargo.py`` script available. The script is preconfigured
 The ``cultcargo`` folder contains YaML files with cab definitions.
 
 If you would like to maintain your own image collection, write your own manifest and Dockerfiles following the cult-cargo example, and use the ``build-cargo.py`` script to build your images.
+
+## Using cult-cargo as a standalone image repository
+
+You don't even need to run stimela (or indeed install anything) to take advantage of the images packaged with cult-cargo. Take a look at the image repository on https://quay.io/organization/stimela2 to see what's available.
+
+For example, if you want to run a wsclean image, just do:
+
+```
+$ singularity build wsclean-3.3.sif docker:quay.io/stimela2/wsclean:3.3-cc0.1.2
+$ singularity exec wsclean-3.3.sif wsclean 
+```

cultcargo/builder/build_cargo.py

@@ -73,7 +73,7 @@ def run(command, cwd=None, input=None):
 @click.option('-v', '--verbose', is_flag=True, help='Be verbose.')
 @click.option('--boring', is_flag=True, help='Be boring -- no progress bar.')
 @click.argument('imagenames', type=str, nargs=-1)
-def build_cargo(manifest: str, do_list=False, build=False, push=False, all=False, rebuild=False, boring=False, 
+def build_cargo(manifest: str, do_list=False, build=False, push=False, all=False, rebuild=False, boring=False,
                 experimental=False, verbose=False, imagenames: List[str] = []):
     if not (build or push or do_list):
         build = push = True
@@ -84,7 +84,7 @@ def build_cargo(manifest: str, do_list=False, build=False, push=False, all=False
             "{task.description}",
             console=console, disable=boring) as progress:
         print = progress.console.print
-    
+
         progress_task = progress.add_task("loading manifest")
 
         print(Rule(f"Loading manifest {manifest}"))
@@ -254,7 +254,7 @@ def resolve_config_reference(value):
                 version_vars["VERSION"] = version
                 version_vars["IMAGE_VERSION"] = image_version
 
-                is_exp = version_info.get('experimental') 
+                is_exp = version_info.get('experimental')
                 exp_deps = version_info.get('experimental_dependencies', [])
 
                 if is_exp or exp_deps:

cultcargo/images/ddfacet/apt.sources.list

@@ -9,4 +9,4 @@ deb http://us.archive.ubuntu.com/ubuntu bionic-backports main restricted univers
 deb-src http://us.archive.ubuntu.com/ubuntu bionic-security main restricted universe multiverse
 deb-src http://us.archive.ubuntu.com/ubuntu bionic-updates main restricted universe multiverse
 deb-src http://us.archive.ubuntu.com/ubuntu bionic-proposed main restricted universe multiverse
-deb-src http://us.archive.ubuntu.com/ubuntu bionic-backports main restricted universe multiverse
+deb-src http://us.archive.ubuntu.com/ubuntu bionic-backports main restricted universe multiverse