feat: add riscv64 arch

[shanduur]

Added riscv64 to goreleaser. Unfortunately ko does not support building for riscv64 (base image limitation).

[ahmetb]

Do you actually need this, or building it for fun?

[shanduur]

Yes, I need this. I am using it for health checking few apps, one of which is k3s-io/kine while serving with mTLS, which Kubernetes does not support natively.

[ahmetb]

If ko is failing to build this image, I suspect the post-merge will be in a broken state from this point on, which is not desirable either. Are you able to find another base image that might work here?

[shanduur]

It’s not like ko is failing - it’s jus not building riscv64, as base image cgr.dev/chainguard/static is only x86_64 and amd64.

[shanduur]

Ah, I just noticed that the probe is built using quite old ko version, I’m not sure what’s the base image is then…

[ahmetb]

Feel free to bump ko in your fork and tag a release there to test.

[ahmetb]

How does it look? Does it build correctly?

[shanduur]

I triggered the release, everything looks fine:

• https://github.com/shanduur/grpc-health-probe/releases/tag/v0.0.1
• https://github.com/shanduur/grpc-health-probe/pkgs/container/grpc-health-probe
• https://github.com/shanduur/grpc-health-probe/actions/runs/14823943802/job/41614608467
• https://github.com/shanduur/grpc-health-probe/actions/runs/14823943800/job/41614608490

linux/riscv64 binary is published and works as it should. There is no well known image with linux/riscv64 support that is minimal enough, thus there is no OCI image with this tuple published.

HOWEVER, according to the following issue, GoogleContainerTools/distroless#1269, and the general build process of distroless images, riscv64 will be supported once the support is released in Debian Trixie. This won't require any changes in the grpc-health-probe - just a new tag to trigger a release.