wasm-pack does not understand overriden target-dir

[fzyzcjy]

🐛 Bug description

Hi thanks for the tool! However, it seems that wasm-pack does not understand overriden target-dir.

🤔 Expected Behavior

no error

👟 Steps to reproduce

1. make a cargo workspace, and one or many cargo crate in it
2. in your crate, set .cargo/config.toml to:

[build]
target-dir = "target"

3. Run wasm-pack build in that crate

Then get:

error: failed reading '/Volumes/MyExternal/ExternalRefCode/flutter_rust_bridge/target/wasm32-unknown-unknown/debug/frb_example_pure_dart.wasm'

Caused by:
    No such file or directory (os error 2)
Error: Running the wasm-bindgen CLI
Caused by: Running the wasm-bindgen CLI
Caused by: failed to execute `wasm-bindgen`: exited with exit status: 1
  full command: "/Users/tom/.cargo/bin/wasm-bindgen" "/Volumes/MyExternal/ExternalRefCode/flutter_rust_bridge/target/wasm32-unknown-unknown/debug/frb_example_pure_dart.wasm" "--out-dir" "/Volumes/MyExternal/ExternalRefCode/flutter_rust_bridge/frb_example/pure_dart/web/pkg" "--no-typescript" "--target" "no-modules" "--out-name" "frb_example_pure_dart" "--debug"

  Command: wasm-pack build -t no-modules -d /Volumes/MyExternal/ExternalRefCode/flutter_rust_bridge/frb_example/pure_dart/web/pkg --no-typescript --out-name frb_example_pure_dart --dev rust -- -Z build-std=std,panic_abort

It seems that wasm-pack is trying to find the files inside the workspace's target dir, while we have overriden the settings such that the .wasm is indeed generated in the custom directory.

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: latest
rustc version: