Add Description Field to Actions Secrets

[karldreher]

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The addition of at least one "meta" field for an Actions Secret would be incredibly valuable, particularly for organization-level secrets but similarly on repo-level.

Currently, Actions secrets allows setting two values: The key (Environment variable name) and the value (secret) itself.

It is neccessary to document the background of these variables, where they are set and why, out of band.
Having the ability to at least have a reference link would be good, but it would be ideal if there was a long description (line and not paragraph) that could be filled in describing the secret's use.