Adding Seafile as a cloud storage option

[bloggi85]

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name: 🚀 Feature Request
about: I have a suggestion

Feature Request

A feature you'd like to see

Seafile is an open-source file sharing platform that is gaining traction and allows users to self-host. It would be awesome if KeePass Tusk would allow to load the key file from it.

Alternatives you've considered

I have historically used Google Drive for this but have since moved over to Seafile as it's the go-to choice for self-hosting data in the cloud.

Additional remarks

Ideally this would integrate in the same way than any other Cloud Provider.