- Force HOME=/root in build-alpine.sh for consistent key location
- Use find instead of ls for key discovery (handles dash-prefixed filenames)
- Search multiple paths for generated keys
- Copy keys from KEY_DIR to builduser home directory
- Set env.HOME=/root in Alpine container spec
- Remove separate abuild-keygen step (handled by build-alpine.sh)
- Add error exit if no signing key found
Co-authored-by: git-echo <git-echo@moon-dragon.us>