Support v1 recipes in CrossRBaseMigrator

[mgorny]

Description:

Add support for v1 recipes in CrossRBaseMigrator. Here the logic
made it easy to output a single combined condition:

    - if: build_platform != target_platform
      then:
        - cross-r-base ${{ r_base }}
        - r-rlang

Checklist:

• Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

Part of bug #3642

[mgorny]

FWICS we could just append all the lines as a single element here, but I've figured out that since it's a list of lines by design, it's cleaner to add them separately.

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.03%. Comparing base (91cc9b6) to head (342e595).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
conda_forge_tick/migrators/cross_compile.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3836   +/-   ##
=======================================
  Coverage   77.02%   77.03%           
=======================================
  Files         138      138           
  Lines       15384    15394   +10     
=======================================
+ Hits        11850    11859    +9     
- Misses       3534     3535    +1     

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[beckermr]

I think we want the flaky decorator inside the pytest parameterize decorator again.

[mgorny]

I think we want the flaky decorator inside the pytest parameterize decorator again.

Sorry about that. Remember about it for Python, failed to remember here.

[beckermr]

We can merge this despite the target_platform versus host_platform issue since we'll need to change that everywhere including rattler later, and this won't happen for a while.

Is that OK @isuruf?

[isuruf]

I don't see a reason to merge this as it is. It's a very simple change that I don't think requires a lot of work.

[mgorny]

Okay, I've just checked rattler-build and host_platform seems to work as well. I'll update both pull requests.

[mgorny]

@beckermr, gentle ping. Is there anything left blocking this PR?

[mgorny]

Thanks!