Trigger slack notifications from chectl release action

[nickboldt]

Describe the solution you'd like

replace https://github.com/eclipse-che/che-release/blob/main/.github/workflows/release-send-mattermost-announcement.yml with an action that notifies: ECD slack channel #forum-che-release that a release is done.

WIP in https://github.com/eclipse-che/che-release/blob/addSlack/.github/workflows/release-send-slack-announcement.yml

Message should be short, with link to release notes for that version.

Ths should be triggered when a new chectl release is completed, from https://github.com/che-incubator/chectl/blob/main/.github/workflows/release-announce.yml (but could also be triggered by workflow)

Additional context

Rather than writing a bot/webhook/app, using built in slack notifications work pretty well.

https://github.com/integrations/slack#configuration

See also:

• https://docs.google.com/document/d/1x1QooSXn1AYkL9LJljuxJteQgJYVltNL37WyJV2N2fY/edit#heading=h.8wiks6s8memb
• [che-release] Add status badges and links to actions  #22549
• Autorelease the Che Release Notes after chectl release #22550

[nickboldt]

nothing showing up in https://app.slack.com/client/TMU5A34SW/C05SD64M85R yet

asked for slack integration to be added to the che-incubator repos (starting with chectl) so we can at least watch for events there.

[nickboldt]

PR notification working:

and updates automatically as tests pass/fail too:

[nickboldt]

working: issues, pulls, releases, branches/tags, issues:

/github subscribe che-incubator/chectl pulls

• includes link to the PR, repo, and tests; slack message updates automatically as changes happen / workflows run

/github subscribe che-incubator/chectl releases

• includes link to the release, eg https://github.com/che-incubator/chectl/releases/tag/20231013185130

/github subscribe che-incubator/chectl branches

• includes link to the branch/tag and repo on creation (and a notification if deleted too)

/github subscribe eclipse/che issues

• includes a link to the issue, repo and threaded comments under it (if comments enabled); otherwise just creation and closure are reported

---

also working: comments and deployments (probably overkill / too verbose):

/github subscribe eclipse/che issues comments

• includes a link to the issue, repo and threaded comments under it; also creation and closure are reported

/github subscribe che-incubator/chectl deployments

• includes link to the action that deployed the gh page

---

Everything is working including workflow notifications:

[nickboldt]

Events to track (currently set up in the #forum-che-release channel on ECD slack:

/github subscribe che-incubator/chectl releases workflows:{event:"workflow_dispatch","push" branch:"main"}  
/github unsubscribe che-incubator/chectl issues pulls commits deployments branches

/github subscribe eclipse-che/che-operator workflows:{event:"workflow_dispatch","push" branch:"main"}
/github unsubscribe eclipse-che/che-operator issues pulls commits releases deployments branches

/github subscribe eclipse-che/che-release workflows:{event:"workflow_dispatch","push" branch:"main"}
/github unsubscribe eclipse-che/che-release issues pulls commits releases deployments branches

/github subscribe eclipse/che issues releases +label:'status/need-triage'
/github unsubscribe eclipse/che pulls commits deployments branches

/github subscribe list features

Events to track (currently set up in the #forum-che channel on ECD slack:

/github subscribe eclipse/che issues releases +label:'status/need-triage'
/github unsubscribe eclipse/che pulls commits deployments branches

/github subscribe list features

README updated at https://github.com/eclipse-che/che-release/blob/main/README.md#notifications

[ibuziuk]

@nickboldt can we close?

[nickboldt]

if you're happy with the outcome here, then yes. Closing