Have multi-arch build in docker hub

[pdonorio]

Hello, thanks for the small cool project!

Any chances we can have also the ARM version of the image in docker hub?
It's necessary with all the people with M1/M2 chip based Macbooks 🙏🏽

As far as my experience goes it's much easier than in the past now with docker to build multi-arch with buildx and push,
or use it through CI, e.g. https://www.docker.com/blog/multi-arch-build-and-images-the-simple-way/.

Let me know if I can help, in case.
Thanks again!

[pdonorio]

Temporary solving this with building my own version.

Leaving here instructions for others

# change base version in Dockerfile
# in https://github.com/brianmoran/mockify/blob/master/Dockerfile#L1
# - FROM golang:1-alpine as builder
# + FROM golang:1.11.13-alpine as builder

docker buildx create --name multiplatform-builder
docker buildx use multiplatform-builder

docker login -u YOURUSER
docker buildx build . \
  --tag YOURUSER/mockify --platform linux/amd64,linux/arm64 --push