fix: set HOME=/root in CI image and add missing build utilities

[maxamillion]

Summary

Fixes two more container image build failures discovered after the tar/gzip and CA cert fixes.

Problem 1: mise: command not found in CI image

Hummingbird sets HOME=/tmp for root. The curl https://mise.run | sh installer places mise at $HOME/.local/bin/mise, which becomes /tmp/.local/bin/mise. The Dockerfile's PATH includes /root/.local/bin but not /tmp/.local/bin.

Fix: Add ENV HOME=/root before mise installation.

Problem 2: cmp: command not found and awk: command not found in Rust builds

The protobuf-src crate builds protobuf from source using autotools. The configure script requires cmp (from diffutils), awk (from gawk), and find (from findutils). Ubuntu includes these by default; Hummingbird does not.

Fix: Add diffutils gawk findutils to the rust-builder-base dnf install.

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