fix(ci): Use snapshot mode for PR builds

[lexfrei]

Summary

Remove pull_request trigger from goreleaser workflow.

Problem

GoReleaser fails on PRs because release mode requires a git tag pointing to the current commit.

Solution

Run goreleaser only on tag pushes. Release builds are not meaningful for PRs.

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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