Multi-Arch Image with arm64

[DWSR]

Bumps to Go 1.19 and builds a multi-arch image for arm64 and amd64.

[erwinvaneyk]

Thanks for the PR, @DWSR !

I checked out your change, but locally my setup (Docker 20.10.22) does run into an error with your changes:

$ make docker-build
docker buildx build . --tag erwinvaneyk/cert-completer:latest --platform linux/amd64,linux/arm64 --load
[+] Building 0.0s (0/0)
ERROR: docker exporter does not currently support exporting manifest lists

We might either want to work around that or document the limitations. What do you think?

[DWSR]

@erwinvaneyk Can you confirm that it works if you export DOCKER_CLI_EXPERIMENTAL=enabled and then run the command?

[erwinvaneyk]

@DWSR apologies for the long delay, it got buried in my notification. But, no, even with that env setup it does not work. This seems to be a known and long-running issue: docker/buildx#59