ARM Multiarch Image

[Dav1dde]

Similar to Relay, we should provide Symbolicator as a multi arch image with support for ARM.

[tobias-wilfert]

I assume this is the work that we did in Relay to achieve this?

[Dav1dde]

This is the Relay PR which added the multiarch image. But instead of cross compiling with cargo-cross I'd consider using an ARM Github Runner now instead, but the general setup stays the same. Build the binary for different architectures then fuse them together into a single multiarch image.