OpenBSD builds request

**Is your feature request related to a problem? Please describe.**
This is a feature request to provide amd64 bit builds of `gotify` server available for download. Currently OpenBSD isn't a download option.
See here: https://github.com/gotify/server/releases/tag/v2.0.5

**Describe the solution you'd like**
I would like to be able to download a tar gz file of `gotify` server, then uncompress, which would run on OpenBSD amd64.

**Describe alternatives you've considered**
None. I think development should switch to whatever current platform they're using now to OpenBSD. ;) See here: https://why-openbsd.rocks/

**Additional context**
I will give a thumbs up once an OpenBSD amd64 bit build is made available.