fix: vm-forward example

[brianmcgee]

lib.mkForce is required

Closes #59

[Jaculabilis]

After getting this error and finding the issues here, I tried both mkForce and @fleaz's solution from #51 using virtualisation.forwardPorts. Both worked for what I tested, but I think the latter is a more user-friendly fix, since it uses existing NixOS options instead of the more heavy-handed mkForce.

[brianmcgee]

After getting this error and finding the issues here, I tried both mkForce and @fleaz's solution from #51 using virtualisation.forwardPorts. Both worked for what I tested, but I think the latter is a more user-friendly fix, since it uses existing NixOS options instead of the more heavy-handed mkForce.

virtualisation.forwardPorts is a much better approach. I've updated the example and the README to reflect this.

[Mic92]

bors merge

[Mic92]

Thx!