Want Github Action to ensure standard names are following character rules

[nusbaume]

As described by the CF-conventions here:

http://cfconventions.org/Data/cf-standard-names/docs/guidelines.html

standard names should start with a letter, and only contain lower-case letters, numbers, and underscores. This rule should be enforceable in an automated fashion, and thus it would be good to have a Github Action for the dictionary that ensures that only standard names that follow this rule are allowed.

[mkavulich]

Resolved via #52