Feature Request: Support arm64 architecture

[NePoCz]

Hi, I built telepush on arm64 (aarch64) locally and everything seems to work fine. The build doesnt take long, but of course would be nice to just pull a published image from the project. For arm64, I did not need to make any changes to build it locally, so hopefully should not be hard. I can help testing if needed.

PS: support for e.g. arm32 (armhf) would be also nice. Both of these would open the project for the fairly numerous raspberryPi's user-base

[muety]

Hi @NePoCz, very good point, I'd love to have ARM images! Pull requests are welcome! For anyone who wants to have a look into this, you can probably take inspiration (aka. copy large parts of it) from https://github.com/muety/wakapi/blob/master/.github/workflows/release.yml.