build: Allow .env.production to be committed

Modify the .gitignore file to explicitly un-ignore the `.env.production` file.

This allows the production environment configuration to be version-controlled, ensuring it is available for build and deployment processes.

.env.production

@@ -0,0 +1,2 @@
+NEXT_PUBLIC_API_URL="https://www.admin.opplens.com/admin/v1/"
+NEXT_PUBLIC_TOAST_AUTO_CLOSE_DURATION=2500

.gitignore

@@ -7,6 +7,7 @@
 .env.test.local
 .env
 
+
 # dependencies
 /node_modules
 /.pnp
@@ -39,7 +40,7 @@ yarn-error.log*
 
 # env files (can opt-in for committing if needed)
 .env*
-
+!.env.production
 # vercel
 .vercel