[vps] Enable nonguix substitutes for the VPS system reconfigure.

Pulls the nonguix kernel and firmware from substitutes.nonguix.org,
alongside the official substitute servers, so `make vps-system` no
longer needs to build the linux kernel from source.

Co-Authored-By: Claude <noreply@anthropic.com>

diff --git a/Makefile b/Makefile
index 896a0460107247a4fc3f02c9cb01f6cee3d8c354..752fb1e3e2e0ca576f37a4d8166513860998034e 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,7 @@ vps-home:
 
 vps-system:
        sudo GUIX_PACKAGE_PATH=`pwd` guix system reconfigure \
-           -L `pwd` -e '(@ (vps-system) vps-operating-system)'
+           -L `pwd` -e '(@ (vps-system) vps-operating-system)' --substitute-urls="https://substitutes.nonguix.org https://bordeaux.guix.gnu.org https://ci.guix.gnu.org"
 
 
 # Build-only targets — validate configuration without activating.