fix: conflict in parsing of -h flag for help and hostname in container run

[Shubhranshu153]

…r run

Issue #, if available:

Description of changes:

1. Fix conflict in parsing of -h flag for help and hostname in container
2. Fix invalid ptr access error at different places of the parsing logic

Testing done:

1. Run with -h flag and check --help works
2. finch run -it --name edge -h edge alpine sh
3. finch compose -h
4. finch compose run --help

• I've reviewed the guidance in CONTRIBUTING.md

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[austinvazquez]

So this [nerdctlCommand.run] must be the infamous parsing function that CLI folks refer to that is long overdue for refactor. I don't have any recommendations today so no reason to block this but it does feel odd to me and difficult to maintain.