ci: send release announcements on publish

[zimeg]

Summary

This PR posts a release announcement to a Slack channel for more celebrations 🎉 Similar: slackapi/bolt-js#2877

Reviewers

Confirm this matches expected outputs with these commands:

export PUBLISHED_PACKAGES='[{"name": "@xx/xx", "version": "1.2.0"}, {"name": "@xx/xy", "version": "0.8.9"}]'
echo "$PUBLISHED_PACKAGES" | jq -r '[.[] | "\(.name)@\(.version)"] | join(", ")'
echo "$PUBLISHED_PACKAGES" | jq -r '[.[] | "https://github.com/${{ github.repository }}/releases/tag/\(.name)@\(.version)"] | join("\n")'

@xx/xx@1.2.0, @xx/xy@0.8.9
https://github.com/${{ github.repository }}/releases/tag/@xx/xx@1.2.0
https://github.com/${{ github.repository }}/releases/tag/@xx/xy@0.8.9

Notes

• The links are unescaped and don't render as expected in the Slack client but the text is correct so I think this is alright as meaningful reference still!

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.

[changeset-bot]

⚠️ No Changeset found

Latest commit: b803d0a

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.38%. Comparing base (494703f) to head (b803d0a).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2571   +/-   ##
=======================================
  Coverage   87.38%   87.38%           
=======================================
  Files          62       62           
  Lines       10256    10256           
  Branches      415      415           
=======================================
  Hits         8962     8962           
  Misses       1273     1273           
  Partials       21       21           

Flag	Coverage Δ
cli-hooks	87.38% <ø> (ø)
cli-test	87.38% <ø> (ø)
logger	87.38% <ø> (ø)
oauth	87.38% <ø> (ø)
socket-mode	87.38% <ø> (ø)
web-api	87.38% <ø> (ø)
webhook	87.38% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

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[WilliamBergamin]

This looks good 💯 nice addition 🚀

[zimeg]

@WilliamBergamin Kind thanks! I added the secret to our publishing environment so let's test this! 🚀