Use release flag instead of version heuristics for action mode detection

[Copilot]

The "Checkout actions folder" step should be emitted in non-release builds based on the isReleaseBuild flag set at build time, not by parsing version strings.

Changes

• pkg/workflow/action_mode.go: Replace version string heuristics in DetectActionMode() with IsRelease() check

  • Before: Parsed version for v* prefix, -dirty suffix, etc.
  • After: Checks isReleaseBuild flag set via -X linker flag at build time
  • Preserves environment override (GH_AW_ACTION_MODE) and GitHub context detection as fallbacks

• pkg/workflow/compiler_action_mode_test.go: Add TestActionModeDetectionWithReleaseFlag() covering release flag behavior with environment overrides and GitHub context

Detection priority

1. Environment variable GH_AW_ACTION_MODE
2. Build-time isReleaseBuild flag
3. GitHub Actions context (release tags/branches)
4. Default to dev mode

Example

// Before: parsed version string
if version != "" && version != "dev" && !strings.Contains(version, "-dirty") && strings.HasPrefix(version, "v") {
    return ActionModeRelease
}

// After: uses build-time flag
if IsRelease() {
    return ActionModeRelease
}

Original prompt

The "Checkout actions folder" should be emitted when building from a non-release build. The release build is controlled by the release flag that is only enabled in the release build. Make sure this logic is implemented correctly and that it does not rely on heuristics parsing the version number.

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