Make PyPI URL look nice in GH Deployments API

[webknjaz]

Description

environment.url is only the link GitHub displays for a deployment (the "View deployment"
button, the environment badge on the workflow run, the entry in the Deployments API). It does
not influence what gets uploaded or where, and it is not part of the PyPI trusted publishing
identity (that is owner/repo + workflow file + environment name).

So far every release deployment pointed at the generic project page. Appending
${{ github.ref_name }} makes each deployment link to the release it actually published, e.g.
https://pypi.org/project/borgbackup/2.0.0b24. The job only runs on tag pushes, and our tags are
bare PEP 440 versions (1.4.5, 2.0.0b24) that already match the PyPI-normalised version, so
the generated URLs resolve.

Context

I was looking into why https://pypi.org/project/borgbackup/1.4.5/#borgbackup-1.4.5.tar.gz says

Uploaded using Trusted Publishing? No

And was a bit puzzled because the CI seems to be configured just fine. Then I saw this possibility of improvement that I sometimes do in my projects and decided to make an in-browser edit. It's obviously not something I can test per your checklist (and again, it's a drive-by) but I'm the author of pypa/gh-action-pypi-publish so you can trust my knowledge here.

// Side note: I've later checked git blame and realized that the last stable release was made before you've set up TP, so your release automation is newer than that and it's probably fine. But if you need 👀/advice on your process in the future (I've seen the multibranched setup) — feel free to tag me.

Checklist

• PR is against master (or maintenance branch if only applicable there)
• New code has tests and docs where appropriate
• Tests pass (run tox or the relevant test subset)
• Commit messages are clean and reference related issues

[ThomasWaldmann]

@webknjaz Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.74%. Comparing base (9d831da) to head (202784f).
⚠️ Report is 14 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10320      +/-   ##
==========================================
- Coverage   87.70%   86.74%   -0.96%     
==========================================
  Files         103      103              
  Lines       18717    18716       -1     
  Branches     2881     2881              
==========================================
- Hits        16415    16235     -180     
- Misses       1600     1774     +174     
- Partials      702      707       +5     

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