Add a recipe for swan (https://swanmodel.sourceforge.io/)

[martin-g]

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.
• Package does not vendor other packages. (If a package uses the source of another package, they should be separate packages or the licenses of all packages need to be packaged).
• If static libraries are linked in, the license of the static library is packaged.
• Package does not ship static libraries. If static libraries are needed, follow CFEP-18.
• Build number is 0.
• A tarball (url) rather than a repo (e.g. git_url) is used in your recipe (see here for more details).
• GitHub users listed in the maintainer section have posted a comment confirming they are willing to be listed there.
• When in trouble, please check our knowledge base documentation before pinging a team.

[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/swan/meta.yaml) and found some lint.

Here's what I've got...

For recipes/swan/meta.yaml:

• ❌ license_file entry is missing, but is required.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/12685948400. 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/swan/meta.yaml) and found it was in an excellent condition.

[martin-g]

@conda-forge/help-c-cpp this is ready for review

[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/swan/recipe.yaml) and found some lint.

Here's what I've got...

For recipes/swan/recipe.yaml:

• ❌ There are 1 too many lines. There should be one empty line at the end of the file.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/12810017609. 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/swan/recipe.yaml) and found it was in an excellent condition.

[xhochy]

If there is a shared library, please test for its existence.

[martin-g]

I am not sure what makes you think there is such.
meta.yaml (v0) used - {{ pin_subpackage(name, max_pin='x') }}
conda-recipe-converter (rattler-build) converted it to dependencies > run_exports >...

Only the binaries are needed. No static libraries.

[martin-g]

#28726 (comment)
I think I understand! run_exports should be used only when the recipe produces a shared library! Makes sense!

In Bioconda it is mandatory for all recipes and I added it automatically...