[WIP] ARM-Support

[ckotzbauer]

This is a WIP-PR of a build with ARM support.
I'm not really sure about the changes in the Makefile. With the changes for windows-support in mind from #460 this would create more and more complicated tooling-scripts to maintain.

My personal favourite is to do only the go-compilation and other small tasks in the makefile and move the image build and -publish to Github Actions which are already able to create multiarch-builds out of the box. But this would remove the ability to create images locally (without writing the commands on your own).

I also would suggest to not separate different architectures by image-tag and use the same tags for different arches.

WDYT?

Ref: #23

[davideshay]

Glad someone else is concerned about arm64 builds. I've provided an alternative to this PR here:
#496

This is a more traditional multi-arch build support approach on github actions using qemu and docker buildx with multi-platform support. No changes to existing makefile were required, but I did move some of the go-build steps to the Dockerfile. Not entirely sure about the approach listed here, but I'm not sure it would generate a multiple-arch manifest, whereas the approach in 496 will.

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[ckotzbauer]

superseded by #496