ci: Update unity-test.yml

[kochounoyume]

This pull request updates the CI workflow configuration in .github/workflows/unity-test.yml to enhance its flexibility and reliability by supporting additional GitHub event types and improving the handling of references.

Workflow configuration updates:

• Modified the if condition for the test job to support additional GitHub event types (pull_request_target, push, and workflow_dispatch) while maintaining the existing condition for the request-ci label.
• Updated the ref parameter in the actions/checkout step to use a fallback to github.sha if github.event.pull_request.head.sha is not available.

[Copilot]

Pull Request Overview

This PR updates the CI workflow configuration to support multiple GitHub event types and improve reference handling. The changes enhance the workflow's flexibility by allowing it to run on different triggers while maintaining existing label-based conditions.

• Modified the job condition to support pull_request_target, push, and workflow_dispatch events
• Added fallback logic for the checkout reference to use github.sha when github.event.pull_request.head.sha is unavailable

[Copilot]

The condition logic is incorrect. For push and workflow_dispatch events, github.event.label.name will not exist, but the current condition requires the label check for pull_request_target events to be true OR the other events to be true. This means push and workflow_dispatch will always trigger the job regardless of the label condition. The condition should be: (github.event_name == 'pull_request_target' && github.event.label.name == 'request-ci') || github.event_name == 'push' || github.event_name == 'workflow_dispatch'

Suggested change

	if: ${{ github.event_name == 'pull_request_target' && github.event.label.name == 'request-ci' || github.event_name == 'push' || github.event_name == 'workflow_dispatch' }}
	if: ${{ (github.event_name == 'pull_request_target' && github.event.label.name == 'request-ci') || github.event_name == 'push' || github.event_name == 'workflow_dispatch' }}