Add AirVPN as provider about docker-transmission-openvpn

[stevepet]

AirVPN uses .ovpn files with private keys generated for each user account. Adding any of these files to the container will only work for the user that generated them. A better solution may be to add a new volume (-v) that points to a configuration directory where users can put their own .ovpn files.
The environment variables OPENVPN_USERNAME and OPENVPN_PASSWORD are also not necessary with these .ovpn files.

[haugene]

Aha, I see. Well, that can be done without any changes to the container as it is today.

To run it with a custom provider and .ovpn file just add:
-v /path/to/custom/config.ovpn:/etc/openvpn/custom/default.ovpn
and then set OPENVPN_PROVIDER=CUSTOM

You still need to set OPENVPN_USERNAME and OPENVPN_PASSWORD as the startup script will fail if they're not there. But they can both be set to "dummy" and it won't have an effect as the ovpn-config will not read them anyways.

[stevepet]

Thanks Kristian, This worked as you described for AirVPN.

[haugene]

Glad to hear it! Instructions are provided in README and code is merged to master. Closing this.