add: added statix, deadnix, nixpkgs_fmt to null-ls sources

plugins/null-ls/servers.nix

@@ -11,6 +11,9 @@
       shellcheck = {
         package = pkgs.shellcheck;
       };
+      statix = {
+        package = pkgs.statix;
+      };
     };
     completion = {};
     diagnostics = {
@@ -26,6 +29,12 @@
       gitlint = {
         package = pkgs.gitlint;
       };
+      deadnix = {
+        package = pkgs.deadnix;
+      };
+      statix = {
+        package = pkgs.statix;
+      };
     };
     formatting = {
       phpcbf = {
@@ -37,6 +46,9 @@
       nixfmt = {
         package = pkgs.nixfmt;
       };
+      nixpkgs_fmt = {
+        package = pkgs.nixpkgs-fmt;
+      };
       prettier = {
         package = pkgs.nodePackages.prettier;
       };

tests/test-sources/plugins/null-ls.nix

@@ -38,12 +38,15 @@
         code_actions = {
           gitsigns.enable = true;
           shellcheck.enable = true;
+          statix.enable = true;
         };
         diagnostics = {
           cppcheck.enable = true;
           flake8.enable = true;
           gitlint.enable = true;
           shellcheck.enable = true;
+          statix.enable = true;
+          deadnix.enable = true;
         };
         formatting = {
           alejandra.enable = true;
@@ -57,6 +60,7 @@
           shfmt.enable = true;
           stylua.enable = true;
           taplo.enable = true;
+          nixpkgs_fmt.enable = true;
         };
       };
     };