Align iOS-KMP workflows with regular iOS workflow features

Summary

The iOS-KMP workflows (ios-kmp-selfhosted-*) are missing several features that have been introduced in the regular iOS workflows (ios-selfhosted-*). This creates inconsistency and means KMP projects don't benefit from optimizations like changelog generation and JIRA integration.

Current State

Feature	Regular iOS	iOS-KMP
Change detection/changelog generation	✅	❌
JIRA integration	✅	❌
Nightly vs On-demand naming	✅	❌
Runner label configurable	✅	❌
Concurrency control (test)	✅	❌

Affected Workflows

• .github/workflows/ios-kmp-selfhosted-test.yml
• .github/workflows/ios-kmp-selfhosted-build.yml
• .github/workflows/ios-kmp-selfhosted-release.yml

Proposed Changes

1. Create ios-kmp-selfhosted-on-demand-build.yml (NEW)

Create a new workflow based on ios-selfhosted-on-demand-build.yml pattern with KMP-specific additions:

• Changelog generation via universal-detect-changes-and-generate-changelog action
• No skip_build logic - on-demand builds should always run
• Manual changelog input override (when provided, skip auto-generation)
• JIRA ticket transition support (optional, activates when JIRA_CONTEXT secret is provided)
• runner_label configuration
• All existing KMP-specific inputs (java_version, kmp_swift_package_*, etc.)

Note: A dedicated nightly build workflow is not needed since kmp-combined-nightly-build.yml already handles nightly builds for both iOS and Android in KMP projects.

2. Deprecate ios-kmp-selfhosted-build.yml

Transform into a deprecation wrapper that:

• Shows deprecation warning in workflow logs
• Calls the new ios-kmp-selfhosted-on-demand-build.yml workflow
• Maintains all existing inputs for backward compatibility

Similar to how ios-selfhosted-build.yml was deprecated.

3. Update ios-kmp-selfhosted-test.yml

Add missing features:

• runner_label input (default: self-hosted)
• Concurrency control to cancel outdated PR runs
• Update runs-on to use dynamic runner label pattern

4. Update ios-kmp-selfhosted-release.yml

Add missing features:

• runner_label input (default: self-hosted)
• Update runs-on to use dynamic runner label pattern

Breaking Changes

None - All changes are backward compatible:

• New inputs have defaults matching current behavior
• Deprecated workflow continues to function via wrapper pattern

Migration Path

Immediate: No action required - existing workflows continue to work.

Recommended migration:

1. Update workflow reference from ios-kmp-selfhosted-build.yml to ios-kmp-selfhosted-on-demand-build.yml
2. Remove PR title fallback for changelog (now auto-generates)
3. Optionally add JIRA_CONTEXT secret for ticket transition
4. Optionally configure runner_label for custom runners

Implementation Order

1. Create ios-kmp-selfhosted-on-demand-build.yml
2. Update ios-kmp-selfhosted-build.yml to deprecation wrapper
3. Update ios-kmp-selfhosted-test.yml
4. Update ios-kmp-selfhosted-release.yml

Start by comparing the regular iOS workflows, especially ios-selfhosted-on-demand-build.yml and the deprecated ios-selfhosted-build.yml, with the three affected iOS-KMP workflows. Done means the new on-demand workflow, deprecation wrapper, runner labels, concurrency control, changelog generation, and optional JIRA support match the issue while preserving existing inputs and behavior.