Add environment variables generators and validators

Added a new generator for creating environment variables and a validator to check the validity of the created variables. Also updated the config file to include these new generators in the list of registered generators.

turbo/generators/config.ts

@@ -1,10 +1,17 @@
 import type { PlopTypes } from '@turbo/gen';
 
+import { createEnvironmentVariablesGenerator } from './templates/env/generator';
 import { createKeystaticAdminGenerator } from './templates/keystatic/generator';
 import { createPackageGenerator } from './templates/package/generator';
+import { createEnvironmentVariablesValidatorGenerator } from './templates/validate-env/generator';
 
 // List of generators to be registered
-const generators = [createPackageGenerator, createKeystaticAdminGenerator];
+const generators = [
+  createPackageGenerator,
+  createKeystaticAdminGenerator,
+  createEnvironmentVariablesGenerator,
+  createEnvironmentVariablesValidatorGenerator,
+];
 
 export default function generator(plop: PlopTypes.NodePlopAPI): void {
   generators.forEach((gen) => gen(plop));