[FEAT] support net mask configuration

[alonbg]

Is this a new feature request?

• I have searched the existing issues

Wanted change

few options for supporting this

1. BYOT (bring your own template) ..
   e.g.
   specify NET_MASK via env
   modify wireguard/templates/server.conf to Address = ${INTERFACE}.1/${NET_MASK:-32}

2. Support above template and parameter as part of the distribution

3. extract mask from INTERNAL_SUBNET

Reason for change

required for multiple remote peer support

Proposed code change

for option 3 - a backward compatible suggestion:

modify this line to INTERFACE="$(IFS=/ read _IP _MASK <<<$INTERNAL_SUBNET; echo $_IP/${_MASK:-32})"

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