task(workflow): Replace matrix build with GoReleaser for releases

[gene1wood]

Switch the release workflow from a manual matrix build across OS/arch combinations to GoReleaser, triggered via workflow_dispatch with an explicit version input. The workflow now creates the git tag, then delegates artifact building and GitHub release creation to GoReleaser.

Pin all action references to commit hashes (checkout v6.0.2, setup-go v6.4.0, goreleaser-action v7.1.0).

Remove generate_release_notes from .goreleaser.yml as the field is not supported in GoReleaser v2. GitHub's auto-generated release notes can be enabled instead via Settings -> General in the repository.

Relates to #446
Fixes #427

[mbrt]

Hey @gene1wood thanks for the contribution! How is this supposed to be used? This will both bump the version and create the release, but what about the release notes? Should I manually re-create them after the workflow completes?

Asking because it's not something I can test beforehand really.

[gene1wood]

How is this supposed to be used?

Sure thing. So when you want to cut a release, you go and trigger the action and in the UI where you trigger the action it prompts for a semver version number. You put in the version you want to give the new release and the action runs.

The action then tags the commit, creates the release and the binaries and writes out the changes (commit messages) in the release notes of the release.

Here's an example of GoReleaser running on the current commit in my fork with a version of 0.11.0-dev that I gave it so you can see what it looks like

https://github.com/gene1wood/gmailctl/releases/tag/v0.11.0-dev

The release notes format isn't rich like your release notes are as it's just a collection of the commit messages. Not sure if that's a deal breaker or not

[mbrt]

Ah thanks, it looks good!

I can redo the notes afterward. I think it's fine.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.56%. Comparing base (aad45b2) to head (2110ef7).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #450   +/-   ##
=======================================
  Coverage   37.56%   37.56%           
=======================================
  Files          54       54           
  Lines        3663     3663           
=======================================
  Hits         1376     1376           
  Misses       2196     2196           
  Partials       91       91           

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