Failed to find existing container image with 'nf-core modules create'

Description of the bug

Hi!

I was trying to create a module for the tool MetaCache, which exists on bioconda, quay.io biocontainers and the singularity repository, but it didn't fill any container URL.

Maybe related:

1. docker pull quay.io/biocontainers/metacache:<tag> only works with the full tag (e.g. 2.5.0--h077b44d_0), not with a tag such as latest or 2.5.0;
2. mulled-search from galaxy-tool-util package also failed to find anything at quay.io.
3. the page https://quay.io/repository/biocontainers/metacache?tab=info says “No build have been run for this repository”

Could be a problem with quay.io?

Command used and terminal output

$ nf-core modules create metacache/build

...
INFO     Using Bioconda package: 'bioconda::metacache=2.5.0'                                                                        
INFO     Could not find a Docker/Singularity container (Could not find singularity container for metacache)                         
WARNING  Could not find a bio.tools ID for 'metacache'
...

System information

Ubuntu 20.04
Python 3.10.2
nf-core 3.2.0

Start by reproducing nf-core modules create metacache/build with the reported nf-core 3.2.0 environment and compare the Bioconda, quay.io Biocontainers, and Singularity lookups. Check the related mulled-search behavior and determine whether the module creation flow should discover the full container tag or report the registry limitation clearly.