Add a helpful validation message when masked variable contains unsupported characters
Release notes
Problem to solve
When creating a new project or group variable, masked variables can't contain characters outside of the Base64 alphabet (RFC4648), and the @, :, . and ~ characters.
We show the same generic error that is unhelpful in resolving the problem when unsupported characters are used for a masked variable value.
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Proposal
When attempting to mask a variable with value that uses unsupported characters, show a clear error message that allows you to fix the problem.
Value can only contain characters from the Base64 alphabet (RFC4648), and the @, :, .and~ characters.
Intended users
Feature Usage Metrics
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