BUILD-10483 update release instructions

[julien-carsique-sonarsource]

Update the release instructions:

• new Slack channel: #ask-github-migration -> #ops-platform-releases
• add a reference to the Communicate Updates, Changes and Migrations xtranet page
• changed Improvements icon that was the same as the title: 🚀 -> ⚡

[hashicorp-vault-sonar-prod]

BUILD-10483

[Copilot]

Pull request overview

This PR updates the release instructions in the README to provide more comprehensive guidance on the release process for the ci-github-actions repository. The changes clarify semantic versioning practices, add a pre-release validation step, update communication channels, and expand the release announcement template.

Changes:

• Added pre-release validation requirements (dogfooding status check)
• Enhanced semantic versioning guidelines with clearer categorization of changes
• Updated Slack channel from #ask-github-migration to #ops-platform-releases
• Added reference to xtranet documentation for major updates requiring user action

Comments suppressed due to low confidence (1)

README.md:1578

• Grammar issue: "following as indicated in" is awkward. Consider rephrasing to "as indicated in" (remove "following") for better readability.

    Communicate major updates, changes and migrations that require action from users following as indicated in

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[sonarqubecloud]

SonarQube reviewer guide

Summary: Updates release process documentation to clarify semantic versioning principles, pre-release checks, and communication procedures.

Review Focus: The shift in communication channel from #ask-github-migration to #ops-platform-releases and the new requirement to follow platform-wide migration communication guidelines. Verify these channel changes and processes are accurate and aligned with current team practices.

Start review at: README.md Release section (lines 1499-1580). This is the only file modified and contains all procedural and communication guidance changes that should be reviewed for accuracy and completeness.

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Quality Gate passed

Issues
0 New issues
0 Accepted issues
0 Dependency risks

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud