ci: cache cargo for the native core job

.github/workflows/test.yml

@@ -103,6 +103,17 @@ jobs:
           github_token: ${{ steps.token.outputs.token }}
           working_directory: ./native
 
+      - name: Cache Cargo
+        uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5.1.0
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            native/target
+          key: native-cargo-${{ runner.os }}-${{ hashFiles('native/Cargo.lock', 'native/crates/immich_core_ffi/rust-toolchain.toml') }}
+          restore-keys: |
+            native-cargo-${{ runner.os }}-
+
       - name: Check formatting
         run: cargo fmt --all --check