Build Tailscale Linux client and example Apache2 configuration

[Bushidosan]

Since Tailscale / Headscale will throw warnings/errors when having mismatching daemon/client versions adding a build for the Tailscale client on Linux helps avoiding this.

I also added an example Apache2 configuration, the value shown in the blogpost (timeout of 0) is not allowed on a standard Apache2 install.

[Bushidosan]

Another small detail, in the blogpost docker exec headscale headscale preauthkeys create --user default --expiration 90d is given as the command to create a new preauth key. This returns an error as the --user flag expects an integer, for the default user this is 1.

[Bushidosan]

root@vm-headscale:/opt/BOFscale/headscale# docker exec headscale headscale preauthkeys create --user default --expiration 90d
Error: invalid argument "default" for "-u, --user" flag: strconv.ParseUint: parsing "default": invalid syntax
root@vm-headscale:/opt/BOFscale/headscale# docker exec headscale headscale preauthkeys create --user 0 --expiration 90d
Error: creating preauthkey: rpc error: code = Unknown desc = auth-key must be either tagged or owned by user
root@vm-headscale:/opt/BOFscale/headscale# docker exec headscale headscale preauthkeys create --user 1 --expiration 90d
hskey-auth-BVZtV3gZjsJz-dDWv7W6ywQMg03OKSqH21g2hD144JpTj_lDyASk_D0b-0Gs8cQl2ZV7xPxy1YFeT