Fix bug with creating .nf-core.yml file when it can't be found

[krokicki]

This PR fixes a bug (#2237) that occurs if you run nf-core modules install in a directory which does not yet have a .nf-core.yml file. The user is promoted if they want to create the file, but then it walks up the tree searching for an .nf-core.yml file and ends up at the root of the filesystem where it tries to create the file (/.nf-core.yml) and fails:

WARNING  'repository_type' not defined in .nf-core.yml
? Is this repository an nf-core pipeline or a fork of nf-core/modules? Pipeline
INFO     To avoid this prompt in the future, add the 'repository_type' key to your .nf-core.yml file.
? Would you like me to add this config now? [y/n] (y):
╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
...

│ mponents/components_utils.py:45 in get_repo_info                                                 │
│                                                                                                  │
│    42 │   │   # Save the choice in the config file                                               │
│    43 │   │   log.info(f"To avoid this prompt in the future, add the 'repository_type' key to    │
│    44 │   │   if rich.prompt.Confirm.ask("[bold][blue]?[/] Would you like me to add this confi   │
│ ❱  45 │   │   │   with open(config_fn, "a+") as fh:                                              │
│    46 │   │   │   │   fh.write(f"repository_type: {repo_type}\n")                                │
│    47 │   │   │   │   log.info(f"Config added to '{config_fn.name}'")                            │
│    48                                                                                            │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
PermissionError: [Errno 13] Permission denied: '/.nf-core.yml'

The fixed algorithm works in this case, and is also optimized to do fewer file existence checks (the current algorithm calls get_first_available_path twice for each directory which is not necessary).

PR checklist

• [ X ] This comment contains a description of changes (with reason)
• [ X ] CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[mirpedrol]

LGTM, thanks for the fix :)

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2c9ccec) 74.93% compared to head (9f5a7d8) 74.96%.
Report is 19 commits behind head on dev.

Files	Patch %	Lines
nf_core/utils.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2562      +/-   ##
==========================================
+ Coverage   74.93%   74.96%   +0.03%     
==========================================
  Files          85       85              
  Lines        9356     9356              
==========================================
+ Hits         7011     7014       +3     
+ Misses       2345     2342       -3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.