Prevent overwrite read only gpg keys

[eheimbuch]

Proposed changes

It was possible to download the default SCM-Manager gpg keys and overwrite them with the same raw key. This made the new key deletable. This behaviour is not longer possible.

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
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100.0% Coverage
0.0% Duplication