Ensure explicit ARM version and add FreeBSD builds

[johnjaylward]

See https://en.wikipedia.org/wiki/Raspberry_Pi#Specifications for RPi arm versions

See https://github.com/golang/go/wiki/GoArm for cross compiling to Arm

• Adds binaries for FreeBSD (some NAS devices like FreeNAS run on this)
• Adds explicit version compilation for ARM architectures.
• Copies the sample config to the release path so it's added as part of the release.