Add arm64 support for ZFS collector Docker image

[Starosdev]

Summary

The ZFS collector Docker image currently only supports amd64. Add arm64 support for users running ZFS on ARM64 servers (AWS Graviton, Ampere Altra, Raspberry Pi 4/5 with 8GB RAM, etc.).

Background

In PR #89, we added the ZFS collector Docker image but limited it to amd64 due to build time issues. The arm64 build under QEMU emulation takes 45+ minutes (vs ~5 minutes for amd64) because installing zfsutils-linux and its dependencies under emulation is extremely slow.

Possible Solutions

1. Accept the long build time - Just add arm64 back and let it run for 45+ minutes. Simple but slow.

2. Cross-compilation approach - Build the Go binary natively with GOOS=linux GOARCH=arm64, then only use QEMU for the final runtime image assembly (which just copies the binary and installs packages).

3. Separate workflow - Run arm64 builds less frequently (e.g., only on releases, not on every develop push).

4. Native ARM runner - Use a native arm64 GitHub runner if available.

Technical Notes

• zfsutils-linux is available for arm64 in Debian Bookworm contrib
• The Go binary cross-compiles cleanly for arm64
• The slow part is apt-get installing zfsutils-linux under QEMU

Related

• PR Merge develop to master: ZFS collector Docker image #89 - Initial ZFS collector Docker image (amd64 only)
• Issue Missing zfs collector image? #85 - Original request for ZFS collector image

[Starosdev]

Related Issues

• Follow-up to PR Merge develop to master: ZFS collector Docker image #89 (initial ZFS collector image)

Priority Note

Lower priority - arm64 ZFS users are a smaller subset. Can be addressed when build infrastructure improves or native ARM runners become available.