chore(operator): add license file to operator container image

[rksharma95]

Purpose of PR?:
This PR adds license file to the kubearmor-operator container image.

Does this PR introduce a breaking change?
No
If the changes in this PR are manually verified, list down the scenarios covered::

Additional information for reviewer? :
Mention if this PR is part of any design or a continuation of previous PRs

Checklist:

• Bug fix. Fixes # (Not related to an open issue)
• New feature (non-breaking change which adds functionality) (Not Applicable)
• Breaking change (fix or feature that would cause existing functionality to not work as expected) (Not Applicable)
• This change requires a documentation update (Not Applicable)
• PR Title follows the convention of <type>(<scope>): <subject>
• Commit has unit tests (Not Applicable)
• Commit has integration tests (Not Applicable)