fmt action with a specified manifest located in a sub-folder did not find the parent folder rustfmt.toml config

[galop1n]

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Description

I am running the action-rs fmt action with a specified manifest in a subdir --manifest-path ./2021/Cargo.toml and the action fail at finding the rustfmt.toml file that is in the parent folder, leading to the formating check to fail

Workflow code

fmt:
    name: Rustfmt
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: actions-rs/toolchain@v1
        with:
          profile: minimal
          toolchain: stable
          override: true
      - run: rustup component add rustfmt
      - uses: actions-rs/cargo@v1
        with:
          command: fmt
          args: --manifest-path ./2021/Cargo.toml --all -- --check 

Action output

Run actions-rs/cargo@v1
  with:
    command: fmt
    args: --manifest-path ./2021/Cargo.toml --all -- --check
    use-cross: false
/home/runner/.cargo/bin/cargo fmt --manifest-path ./2021/Cargo.toml --all -- --check
Diff in /home/runner/work/advent-of-code/advent-of-code/2021/src/common.rs at line 7:
 /// ```
 pub fn cartesian<I, E>(a: I, b: I) -> impl Iterator<Item = (E, E)>
 where

Expected behavior

The rustfmt command should be able to pull the config from the parent folder.