Only AMD64 builds pushed to docker

[HarryPeach]

Despite the GitHub actions seemingly having a line to build different architectures, only the AMD64 one is published on the docker page

https://hub.docker.com/r/rapiz1/rathole/tags

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[sjtrny]

Hi @HarryPeach, which architectures do you want? The development version now has amd64 and arm64.

[WhitespaceQ]

+1, I need mipsbe/le build for my router. Cross compiling myself is possible but if the pipelines already allows another architecture I don't see why not.

edit: I see why mips release is somewhat deprecated due to it being a tier 3 target. fwiw mipselsf works on my device