add cargo fmt and cargo check to CI

Author: sam0x17

.github/workflows/check-rust.yml

@@ -100,6 +100,10 @@ jobs:
         with:
           key: ${{ matrix.os }}-${{ env.RUST_BIN_DIR }}
 
+      - name: cargo fmt
+        run: cargo fmt --check
+      - name: cargo check
+        run: cargo check --workspace
       ## TODO: maybe use `if` conditions in tests to target `--package <name>`
       - name: Run tests
         # timeout-minutes: 30