Add custom file output path for `settings.xml`

[zteater]

I dumped the settings.xml generated by maven-settings-xml-action then copied the content to the test file in the repo.
I did some formatting for readability, otherwise it is the generated content including ${env.DEPLOY_USER_REF}.
When using that with --settings Maven again does not attempt to decrypt and it works!

I hope this is not a formatting issue.

Would it be possible to extend this action with the possibility to write the file somewhere else - keeping the default as it is for compatibility?
I write somewhere in the github workspace and then pass it to Maven.

Originally posted by @robertklaus-bosch in #97 (reply in thread)

[zteater]

Added to release v18