Running superlinter as a user not defined in /etc/passwd causes error messages

[sabbene]

Fixes #

Proposed Changes

1. Change the whoami command to use id -un and discard stderr. Currently, when running superlinter with a UID that whoami or the id command cannot resolve. Two things happen:
   A) The following error is emitted: whoami: cannot find name for user ID 1234
   B) In the debug output the contents of "Runner" is blank like this: [DEBUG] Runner:[]

By changing to id -un 2>/dev/null, The error message is not printed, and the Runner is set to the uid if it is unable to determine a username: [DEBUG] Runner:[1234]
The standard behavior is retained when a username can be determined: [DEBUG] Runner:[root]

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[zkoppert]

@sabbene Thanks for taking the time to contribute this back here! Appreciate the improvement! 🎉