Move kernel config to its own role.

nix/configuration/configuration.nix

@@ -54,6 +54,7 @@ in
     ./roles/iso_mount
     ./roles/jujutsu
     ./roles/kanshi
+    ./roles/kernel
     ./roles/kodi
     ./roles/kubernetes
     ./roles/latex
@@ -139,7 +140,8 @@ in
     # Automatic garbage collection
     nix.gc = lib.mkIf (!config.me.buildingPortable) {
       # Runs nix-collect-garbage --delete-older-than 5d
-      automatic = true;
+      # automatic = true;
+      automatic = false;
       persistent = true;
       dates = "monthly";
       # randomizedDelaySec = "14m";
@@ -235,12 +237,10 @@ in
       in
       [
         (disableTests "deno") # Tests use too much disk space
-        (final: prev: {
-          inherit (final.unoptimized)
-            libtpms
-            ;
-        })
+        (disableOptimizations "libtpms")
         (disableOptimizationsPython3 "scipy")
+        (disableOptimizations "assimp")
+        (disableOptimizations "gsl")
 
         # Works but probably sets python2's scipy to be python3:
         #