[feature] Added support for WireGuard #225

[pandafy]

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Added two images:

• wireguard: image that runs WireGuard server
• wireguard_updater: image that runs a Flask app that is used for triggering configuration update for WireGuard server.

Closes #225

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TODO

• [ ] Restrict sudo access on celery and wireguard images.

[pandafy]

In the code I see that vpn_id is a required parameter, but are you sure the current version of OpenWISP Controller sends this in the request? https://github.com/openwisp/openwisp-controller/blob/c02d5279614935790b51863aff623d525c279f41/openwisp_controller/config/tasks.py#L92-L106

I am aware that openwisp-controller does not send vpn_id in the request. Hence, I have added in the docs on how to configure the webhook endpoint

https://github.com/openwisp/docker-openwisp/blame/f58450c5589897b9eb42e9fb3116adf8742c888a/docs/tutorials/deploying-wireguard-vpn.md#L91-L108

I am double checking the cron job