Support additional architectures #14
Description
We have historically, and currently, only supported the x86_64/amd64 architecture. As far as I'm aware, all of the prerequisites which are out of our control already exist to build for arm64. Anticipating this, I've been ensuring that this project, and the st-exim project have accommodations to support other architecture builds fairly seemlessly. st-exim already builds a arm64 version.
Eventually, it would be nice to build complete arm64 images. Currently, I'm aware of ucore which produces Bootc server images for aarch64 (Fedora lingo for Debian's arm64).
It would be most useful if we provided pre-baked images for common platforms like the Raspberry Pi (64 bit support started for 3B, but this may be unreasonably weak. Model 4 with 4+GB would probably be recommended). However, the main target would be native virtualization on a ARM host.