Feature request: Protonvpn port forwarding with multiple ports

[qdm12]

What's the feature 🧐

Protonvpn supports up to 5 ports (TCP+UDP count as 1). One just needs to request the port with the natpmp protocol specifying 5 different internal ports of their choosing. The external port won't match the internal ports though. Right now it's only one port (we send internal port 0 and external port 1), but the external and internal ports match.

Extra information and references

• See https://www.reddit.com/r/ProtonVPN/comments/zv3dva/comment/jlgkq6r/
• Initially discussed in P2P Proton VPN Ports gluetun-wiki#66

[github-actions]

@qdm12 is more or less the only maintainer of this project and works on it in his free time.
Please:

• do not ask for updates, be patient
• 👍 the issue to show your support instead of commenting
  @qdm12 usually checks issues at least once a week, if this is a new urgent bug,
  revert to an older tagged container image