Test on different GNU/Linux/*BSD/UNIX flavours

[troglobit]

• [x] Ubuntu Linux 18.04
• [ ] Debian GNU/Linux 9.5
• [x] Alpine Linux
• [ ] openSUSE
• [ ] Fedora
• [ ] RedHat/RHEL/CentOS
• [x] OpenBSD
• [x] FreeBSD
• [x] NetBSD
• [x] DragonFly BSD
• [x] illumos/OpenIndiana
• [ ] Dyson

[troglobit]

As of 955b4c8, all the BSD variants are now supported.

Note: I do expect the other Linux distros to just work.

[troglobit]

As of e4c4427, the Solaris/Illumos family is also supported.

Fixed in v0.12