API Call to Get Repository Mirror SSH Key
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### Proposal
As far as I can find in the documentation, there is no way through CLI to fetch the SSH Public Key for a mirrored repository (pushing from GitLab). There are calls to fetch user SSH keys - would it be possible to implement / do there already exist calls for this?
For example, something like:
`curl --request GET --header "PRIVATE-TOKEN: {GITLAB_TOKEN}" "https://gitlab.com/api/v4/projects/19768193/keys"`
issue