Add a feedstock for Cubep3m - cosmological n-body code

[martin-g]

Waiting for a proper release and a license file
(jharno/cubep3m#16)

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• License file is packaged (see here for an example).
• Source is from official source.
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[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/cubep3m/meta.yaml) and found some lint.

Here's what I've got...

For recipes/cubep3m/meta.yaml:

• ❌ There are too few lines. There should be one empty line at the end of the file.
• ❌ license_file entry is missing, but is required.
• ❌ This recipe is using a compiler, which now requires adding a build dependence on {{ stdlib("c") }} as well. Note that this rule applies to each output of the recipe using a compiler. For further details, please see META: {{ stdlib("c") }} migration conda-forge.github.io#2102.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/12374880136. Examine the logs at this URL for more detail.}

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/cubep3m/meta.yaml) and found it was in an excellent condition.