support for armv7 and arm64 docker images

[vchrisb]

With external-dns becoming part of the official kubernetes ecosystem, it would be helpful to support armv7 and arm64 docker images.

Using docker buildx on Docker for Mac, external-dns can be build easily with only a small change in the Makefile or Dockerfile.
Golang does not support race checks for armv7 and does not work on Docker for Mac at all, because it apparently uses a smaller vma of 39 instead of 42.
So either it is necessary to remove the go test step in the Dockerfile or remove the -race in the Makefile for building multiaarch images.

Using Github Actions with https://github.com/crazy-max/ghaction-docker-buildx works great too, but also lacks a vma of 42.
So adding sed -i'.bak' -e s/-race//g Makefile to the build script works:
https://github.com/vchrisb/external-dns/blob/master/.github/workflows/main.yml

My Multiaarch Images can be found here: https://hub.docker.com/repository/docker/vchrisb/external-dns

My orginal is issue #1139 which closed.

[fejta-bot]

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/lifecycle stale

[Raffo]

/remove-lifecycle stale

[sean-abbott]

I am using vchrisb's image and it works well, but it'd be nice to just have it coming straight from the source at release time.

[seanmalloy]

/close
/triage duplicate

This is a duplicate of #1443.

[k8s-ci-robot]

@seanmalloy: Closing this issue.

In response to this:

/close
/triage duplicate

This is a duplicate of #1443.

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