feat: use action mode for release builds instead of release mode

[Copilot]

Summary

Changes DetectActionMode to return ActionModeAction instead of ActionModeRelease for release builds. This means compiled workflows for release binaries will reference actions from github/gh-aw-actions (the external actions repo) rather than github/gh-aw (the main repo).

Changes

• pkg/workflow/action_mode.go: Updated DetectActionMode to return ActionModeAction when:
  • isReleaseBuild=true (binary built with release flag via -X main.isRelease=true)
  • Running in GitHub Actions release context (release tags refs/tags/*, release branches refs/heads/release*, or release event)
• pkg/workflow/compiler_action_mode_test.go: Updated test expectations to match new ActionModeAction return value for all release scenarios

Security Summary

No security vulnerabilities introduced or discovered.

[Copilot]

Pull request overview

Changes DetectActionMode to return ActionModeAction instead of ActionModeRelease for release builds, so compiled workflows reference actions from the external actions repo.

Changes:

• Updated DetectActionMode to return ActionModeAction for release flag and GitHub Actions release context
• Updated tests to expect ActionModeAction instead of ActionModeRelease

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/workflow/action_mode.go	Changed return value from ActionModeRelease to ActionModeAction for release conditions
pkg/workflow/compiler_action_mode_test.go	Updated test expectations to match new return values

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