Environment variables are not exapnded when used in the "Files to fingerprint" field.

Additionally, the "Files to archive" field supports environment variable expansion, which causes a disconnect when the "Fingerprint all archived artifacts" is used. In this scenario Fingerprinter reuses the target string from the ArtifactArchiver, but does not expand the variables, causing it to not work properly.

I'll be submitting a pull request shortly to fix this.