Allow configuring rbenv executable path #2875
Merged
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Motivation
Ref #2822 (comment)
Allow configuring the rbenv executable path if it's not installed in the default location and cannot be found automatically.
Implementation
Added a new setting under version manager. If the value is set to something, we use that as the rbenv path, otherwise we fallback to the default installation path.
Implementation also makes sure that the specified path exists.
This has been inspired by #1914
Automated Tests
Added a test to verify that we use the configured value to invoke rbenv.