re-add crate caching

.github/workflows/verify.yml

@@ -28,6 +28,14 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - run: rustup default stable
+    - name: cache crates
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
     - name: check
       working-directory: ./unnamed-game-engine
       run: cargo check