only run rust workflow if rust changed

.github/workflows/rust.yml

@@ -2,19 +2,26 @@ name: Rust
 
 on:
   push:
-    branches: [ "main" ]
+    branches: ["main"]
+    paths:
+      - src/**
+      - Cargo.lock
+      - Cargo.toml
   pull_request:
-    branches: [ "main" ]
+    branches: ["main"]
+    paths:
+      - src/**
+      - Cargo.lock
+      - Cargo.toml
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
-    - name: Build
-      run: cargo build --verbose
+      - uses: actions/checkout@v4
+      - name: Build
+        run: cargo build --verbose