nvim-dap: add type for configurations

modules/plugins/debugger/nvim-dap/nvim-dap.nix

@@ -211,6 +211,29 @@
         };
     };
   };
+
+  configurationType = submodule {
+    freeformType = attrsOf anything;
+    options = {
+      type = mkOption {
+        type = str;
+        description = "Which debug adapter to use";
+      };
+
+      request = mkOption {
+        type = str;
+        description = ''
+          Either `attach` or `launch`. Indicates whether the debug adapter
+          should launch a debugee or attach to one that is already running.
+        '';
+      };
+
+      name = mkOption {
+        type = str;
+        description = "A user-readable name for the configuration";
+      };
+    };
+  };
 in {
   options.vim.debugger.nvim-dap = {
     enable = mkEnableOption "debugging via nvim-dap";
@@ -248,7 +271,7 @@ in {
     };
 
     configurations = mkOption {
-      type = attrsOf (listOf anything);
+      type = attrsOf (listOf configurationType);
       default = {};
       description = ''
         Mapping of filetype to list of possible `Configuration`.