Vm : Add options & reduce nix min-free to 1G.

module/Nix.nix

@@ -15,8 +15,8 @@
 		# When running GC, keep build dependencies.
 		keep-outputs = true;
 
-		# Run GC automatically when there's a 50 GB or less free space.
-		min-free = 50 * 1000 * 1000 * 1000;
+		# Run GC automatically when there's a less free space than specified.
+		min-free = 1 * 1000 * 1000 * 1000;
 	};
 
 	# NOTE: Currently I run GC completely, but this setting (put above near min-free)

module/Vm.nix

@@ -0,0 +1,14 @@
+{ ... }: {
+	virtualisation.vmVariant = {
+		virtualisation = {
+			memorySize = 4 * 1024;
+			diskSize   = 20 * 1024;
+			cores      = 4;
+			restrictNetwork = false;
+			resolution = {
+				x = 1280;
+				y = 720;
+			};
+		};
+	};
+}