Failed compile wasm file on M1.

log
```
$ docker run --rm -v "$(pwd)":/code \
--mount type=volume,source="$(basename "$(pwd)")_cache",target=/code/target \
--mount type=volume,source=registry_cache,target=/usr/local/cargo/registry \
cosmwasm/workspace-optimizer:0.12.6
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
1.60.0-x86_64-unknown-linux-musl (default)
cargo 1.60.0 (d1fd9fe2c 2022-03-01)
Building artifacts in workspace ...
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { inner: ErrorInner { kind: Custom, line: None, col: 0, message: "missing field `workspace`", key: [] } }', src/main.rs:35:55
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```