Improve CLI Dockerfile - Githubissues

This pull request makes a few minor tweaks to the CLI Dockerfile:

[x] Have you followed the guidelines in our Contributing document?
[x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
[x] Does your PR follow our Code of Conduct?
[x] Have you added an explanation of what your changes do and why you'd like us to include them?
[x] Does each method or function "do one thing well"? Reviewers may recommend methods be split up for maintainability and testability.
[x] Is this code designed to be testable?
[x] Is the code documented well?
[x] Does your submission pass existing tests (or update existing tests with documentation regarding the change)? Not applicable: infrastructure change
[x] Have you added tests to cover your changes? Not applicable: infrastructure change
[x] Have you linted your code prior to submission? Not applicable: infrastructure change
[x] Have you updated the documentation and README? Not applicable: no API surface change
[x] Is PII treated correctly? In particular, make sure the code is not logging objects or strings that might contain PII (e.g. request headers). Not applicable: infrastructure change
[x] Have secrets been stripped before committing? Not applicable: infrastructure change

microsoft / agogosml