Add rustfmt for nightly toolchain (fix attempt)

Author: zolagonano

.github/workflows/ci.yml

@@ -19,6 +19,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
+      - run: rustup component add rustfmt
       - run: cargo build --workspace --verbose
       - run: cargo test --workspace --verbose
       - run: cargo fmt -- --check