Change `output identity_ids` to new `container_app_identities`

[lonegunmanb]

Describe your changes

This pr improved the output identity_ids.

Issue number

43

Checklist before requesting a review

• [ ] The pr title can be used to describe what this pr did in CHANGELOG.md file
• [ ] I have executed pre-commit on my machine
• [ ] I have passed pr-check on my machine

Thanks for your cooperation!