Allow to update borgbase repositories

[jobroe]

This PR allows to update existing borgbase repositories.

Why it is needed:

• When a sever needs to be rebuild with the help of ansible, it's not wanted to create a another borgbase repository. Instead the new ssh-key should be added to allow restoring from borg-backup.

How it works:

• When the given repository name already exist on borgbase, instead of failing the ssh-key will be added to existing repository.

Let me know, what are think about and if something is missing/should be changed !

Thanks

[m3nu]

Good change and simple implementation. Just some simplifications needed to arrive a Python best practice.

[m3nu]

Thanks! Merged and updated on Ansible Galaxy.

[m3nu]

I added some filters to the GraphQL API to search repos and SSH keys by name or hash and query a single repo or key.

There could be some small benefits from this for this PR, but nothing major, since neither the repo name or key name are guaranteed to be unique. Currently this PR will just pick the last occurrence of either.

More: https://api.borgbase.com/graphql (click Docs on the right)