Update Docker release action with multi-platform

[kaschula]

Update the docker/build-push-action@v2 to include the platforms: linux/amd64,linux/arm64 argument. This will ensure the Docker release step builds for the arm64 as well as amd64 platforms.

[joschi]

@kaschula Thanks for your contribution!

Would we have to update anything in the Dockerfile, e. g. the base images or something else so that it the resulting container image actually works on ARM64?

https://github.com/OpenAPITools/openapi-diff/blob/4d755a6aa22f06936bad7b1a8fdaa07182976632/Dockerfile

[kaschula]

Hi @joschi ,

Looking at this https://www.docker.com/blog/faster-multi-platform-builds-dockerfile-cross-compilation-guide/ there is guide for updating the Dockerfiles to cope with different architecture builds. I can't see if this is necessary though or if it is just done for efficiency. I will need some time to look into it. Thanks

[eth0net]

As long as the base image is available in ARM64, which it is, this should work fine. It built and ran successfully in ARM64 during local testing on an M1 MacBook Pro using the ARM version of docker.

See the base image support here and here.

[joschi]

@kaschula @eth0net Thanks for your feedback! I'll merge this PR then. 😄