Feature: Support aarch64 (arm64)

[t3hmrman]

Context

At present with the work done on #8 the only supported platform is Alpine (x86_64-unknown-linux-gnu). In order to support more

Proposal

Add support (and automated testing) for more platforms:

- [ ] x86_64-unknown-linux-gnu (via. -bookworm)

• aarch64-unknown-linux-musl (via -alpine3.18)
• aarch64-unknown-linux-gnu (via -bookworm)

Ideally, all of these builds should fit in the same multi-platform manifest where possible.

Alternatives

N/A

Additional Links

Add any additional links/background information here.

[t3hmrman]

An update here -- we can probably ignore making an explicitly debian-backed image -- the important thing is to get arm64 images out, in glibc/musl forms (for whichever is available at the time)