removing empty nix folders

Author: timbastin

nix/oci.nix

@@ -74,6 +74,8 @@
     fakeRootCommands = ''
       mkdir -p /tmp
       chmod 1777 /tmp
+      # Normalize transient Nix state dirs for reproducible image layers.
+      rmdir /nix/var/nix/builds /nix/var/nix /nix/var 2>/dev/null || true
     '';
     enableFakechroot = true;
 
@@ -108,6 +110,7 @@
       mkdir -p var/lib/postgresql/data
       mkdir -p var/run/postgresql
       chown -R 999:999 var/lib/postgresql var/run/postgresql
+      rmdir /nix/var/nix/builds /nix/var/nix /nix/var 2>/dev/null || true
     '';
     enableFakechroot = true;