Fix CI

Hopefully fix the CI running pre-commit
Add a CI build step
Add a CI `cargo test` step

.gitlab-ci.yml

@@ -7,4 +7,6 @@ check:
   tags:
     - nix
   script:
-    - nix flake check -L
+    - nix develop --command pre-commit run -a
+    - nix build -L
+    - nix develop --command cargo test

src/main.rs

@@ -6,7 +6,7 @@ fn main() {
     for mod_name in mgr.get_modules() {
         let mut module = mgr.get_module(&mod_name);
         println!("Module: {}", module.get_name());
-        let random_number: i32 = rand::rng().gen_range(1..=20);
+        let random_number: i32 = rand::rng().random_range(1..=20);
         let random_number_str = format!("John.3.{}", random_number);
         module.set_key_text(&random_number_str);
         println!(