Rewrite roles.ps1 in bash

[ahnl]

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Purpose

I encountered issues while trying to execute the roles.ps1 script on Ubuntu running PowerShell for Linux, primarily due to difficulties in installing Azure CLI on this platform. To address this, I've rewritten the exact script in Bash, which has proven to work on my end.

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[x] Other... Please describe: New utility script

[ahnl]

@microsoft-github-policy-service agree

[pamelafox]

Thanks @ahnl for the PR. I've made a few tweaks to the README and also chmod'ed the script +x. This looks good to me.