move environment module to integrations

apps/server/src/integrations/environment/environment.validation.ts

@@ -0,0 +1,20 @@
+import { IsString, IsUrl, validateSync } from 'class-validator';
+import { plainToInstance } from 'class-transformer';
+
+export class EnvironmentVariables {
+  @IsString()
+  NODE_ENV: string;
+
+  @IsUrl({ protocols: ['postgres', 'postgresql'], require_tld: false })
+  DATABASE_URL: string;
+}
+
+export function validate(config: Record<string, any>) {
+  const validatedConfig = plainToInstance(EnvironmentVariables, config);
+
+  const errors = validateSync(validatedConfig);
+  if (errors.length > 0) {
+    throw new Error(errors.toString());
+  }
+  return validatedConfig;
+}