Support ARM/ARM64/AMD64 architectures

[xunholy]

Fixes:

• Support ARM architecture #309
• refactor Dockerfile names to maintain correct file type and IDE linting
• remove unnecessary for loops building different ARCHS
• remove hardcoded GOARCH and GOOS on go build
• encapsulate build process inside docker therefore no longer having to configure build dependencies on the local machine, however, it still allows for local development if you do not wish to use docker.

TODO:

• refactor image tags in GitHub actions workflow
• cleanup makefile & remove unnecessary functions

Suggestions:

• update go modules with go mod init and use Golang GO111MODULE=on to keep consistent with the latest best practices
• update Dockerfiles to cache dependencies go mod download (dependant on the previous suggestion)

[xunholy]

@rndstr comments in response to the old thread.

this agent installs other agents which would need to be built for ARM64 as well (like https://github.com/weaveworks/scope)

I'm happy to work with your team to make all these images cross-compatible with different architectures. I'm currently involved in a large community that are running Kubernetes clusters using Raspberry Pi's, hence ARM architecture - You can also see that we've been building Flux for ARM architecture among many other opensource projects: https://github.com/raspbernetes/multi-arch-images

we probably don't want to move to GH actions in this repo

I don't mind, Github actions were free and easy for me to test, the current CircleCI config looked a bit daunting at first but if this is the mandate I'd be happy to give it a crack to update it there.

[xunholy]

@rndstr was there any update?

[rndstr]

@xunholy not much changed unfortunately. There is interest in supporting ARM64 but I'm not sure how soon this will be picked up.

[xunholy]

Closing PR due to community inactivity and I no longer use weave, happy to pick up and update everything when there is interest.