Add impermanence create option

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/system/impermanence/options.nix

@@ -121,6 +121,16 @@ in
                         type = str;
                         readOnly = true;
                       };
+
+                      create = mkOption {
+                        type = enum [
+                          "none"
+                          "file"
+                          "directory"
+                        ];
+                        default = "none";
+                        description = "Whether to create the file or directory in persistence if it does not exist.";
+                      };
                     };
                   }
                 )
@@ -257,6 +267,7 @@ in
                 source=${lib.strings.escapeShellArg c._sourceRoot}
                 target=${lib.strings.escapeShellArg c._targetRoot}
                 path=${lib.strings.escapeShellArg c.path}
+                create=${lib.strings.escapeShellArg c.create}
 
                 ${builtins.readFile ./scripts/start.sh}
               '';
@@ -264,6 +275,7 @@ in
                 source=${lib.strings.escapeShellArg c._sourceRoot}
                 target=${lib.strings.escapeShellArg c._targetRoot}
                 path=${lib.strings.escapeShellArg c.path}
+                create=${lib.strings.escapeShellArg c.create}
 
                 ${builtins.readFile ./scripts/stop.sh}
               '';