Add reproducible builds support in OHCL-Linux-Kernel#115

Draft

namancse wants to merge 5 commits intoproduct/hcl-main/6.12from

user/namjain/reprobuild-pipeline-golden-working

Commits on Jan 20, 2026

Enable reproducible kernel builds: Disable Build ID in VDSO
Naman Jain
committed

Commits on Jan 21, 2026

Add NixOS reproducible build infrastructure
Naman Jain
committed

Commits on Jan 28, 2026

Add HCL kernel build script for CI pipeline
Naman Jain
committed

Commits on Jan 29, 2026

Improve Nix setup for reliable PATH configuration
Naman Jain
committed
Use pure Nix environment for reproducible kernel builds
Naman Jain
committed