[mwbrooks]

Changelog

N/A, this changes release automation only.

Summary

This pull request lets maintainers and the team hear about each Slack CLI release in Slack, without anyone posting it by hand, matching what our other slackapi projects already do.

• A release: published trigger on the release workflow runs a new notify job that sends the release link and version to the release announcements webhook.
• The existing rc job skips release events, and pre-releases (dev-build and feature tags) don't post.

Testing

• Not run yet: the first real check is publishing the next release from the GitHub Releases page and confirming one post arrives with the release link.
• Confirmed SLACK_RELEASE_ANNOUNCEMENTS_WEBHOOK_URL is available to this repo as an organization secret.

Notes

• The post goes out when the release is published, a few minutes before CircleCI finishes uploading the binaries to it.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.11%. Comparing base (0e78f36) to head (f4ad405).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #717      +/-   ##
==========================================
+ Coverage   78.09%   78.11%   +0.01%     
==========================================
  Files         238      238              
  Lines       18106    18106              
==========================================
+ Hits        14140    14143       +3     
+ Misses       3966     3963       -3     

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[mwbrooks]

note: Without this line, publishing a release would also run RC now that we subscribe the published as well.