Wasm run command in build script freezes

[CJBuchel]

🐛 Bug description

I'm unsure if this is officially supported or not, I see that the documentation is scarce for build scripts.
I was hoping to try use the wasm-pack crate as a build dependency and use it in the build script for some local automation.

I tried using the build options and commands to run the wasm build command like so.

let options = BuildOptions {
    path: Some(std::env::current_dir()?),
    scope: None,
    disable_dts: true,
    target: wasm_pack::command::build::Target::NoModules,
    debug: true,
    dev: true,
    out_dir: get_workspace_path()?.join("tms-client").join("web").join("pkg").to_string_lossy().to_string(),
    out_name: Some("rust_lib_my_app".to_string()),
    extra_options: vec![],
    ..Default::default()
  };

  let command = wasm_pack::command::Command::Build(options);
  wasm_pack::command::run_wasm_pack(command)?;

  Ok(())

But I came into an issue where the command would seemingly execute, but freeze waiting for the file lock on the build directory

     Running `CARGO=/home/cj/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo CARGO_CFG_OVERFLOW_CHECKS='' CARGO_CFG_PANIC=unwind CARGO_CFG_RELOCATION_MODEL=pic CARGO_CFG_TARGET_ABI='' CARGO_CFG_TARGET_ARCH=x86_64 CARGO_CFG_TARGET_ENDIAN=little CARGO_CFG_TARGET_ENV=gnu CARGO_CFG_TARGET_FAMILY=unix CARGO_CFG_TARGET_FEATURE=fxsr,sse,sse2 CARGO_CFG_TARGET_HAS_ATOMIC=16,32,64,8,ptr CARGO_CFG_TARGET_HAS_ATOMIC_EQUAL_ALIGNMENT=16,32,64,8,ptr CARGO_CFG_TARGET_HAS_ATOMIC_LOAD_STORE=16,32,64,8,ptr CARGO_CFG_TARGET_OS=linux CARGO_CFG_TARGET_POINTER_WIDTH=64 CARGO_CFG_TARGET_THREAD_LOCAL='' CARGO_CFG_TARGET_VENDOR=unknown CARGO_CFG_UB_CHECKS='' CARGO_CFG_UNIX='' CARGO_ENCODED_RUSTFLAGS='' CARGO_MANIFEST_DIR=/home/cj/Documents/code/TMS/tms-infra CARGO_PKG_AUTHORS='' CARGO_PKG_DESCRIPTION='' CARGO_PKG_HOMEPAGE='' CARGO_PKG_LICENSE='' CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=tms-infra CARGO_PKG_README='' CARGO_PKG_REPOSITORY='' CARGO_PKG_RUST_VERSION='' CARGO_PKG_VERSION=0.1.0 CARGO_PKG_VERSION_MAJOR=0 CARGO_PKG_VERSION_MINOR=1 CARGO_PKG_VERSION_PATCH=0 CARGO_PKG_VERSION_PRE='' DEBUG=true HOST=x86_64-unknown-linux-gnu LD_LIBRARY_PATH='/home/cj/Documents/code/TMS/target/debug/deps:/home/cj/Documents/code/TMS/target/debug:/home/cj/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib:/home/cj/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib:/home/cj/Documents/code/TMS/target/debug/build/bzip2-sys-683c5c1a62d34001/out/lib:/home/cj/Documents/code/TMS/target/debug/build/ring-b1483ee963101adc/out:/home/cj/Documents/code/TMS/target/debug/build/zstd-sys-cdfe71eec8a6e140/out' NUM_JOBS=20 OPT_LEVEL=0 OUT_DIR=/home/cj/Documents/code/TMS/target/debug/build/tms-infra-9c4e3f84f30cf6ab/out PROFILE=debug RUSTC=/home/cj/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/rustc RUSTDOC=/home/cj/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/rustdoc TARGET=x86_64-unknown-linux-gnu /home/cj/Documents/code/TMS/target/debug/build/tms-infra-ad9ac73092db3bd4/build-script-build`
[tms-infra 0.1.0] cargo:rerun-if-changed=src
[tms-infra 0.1.0] Done!
[tms-infra 0.1.0] [INFO]: 🎯  Checking for the Wasm target...
[tms-infra 0.1.0] [INFO]: 🌀  Compiling to Wasm...
[tms-infra 0.1.0]     Blocking waiting for file lock on build directory
    Building [=======================> ] 312/314: tms-infra(build)    

And it seems to get stuck waiting for the file lock forever.

🤔 Expected Behavior

Build script generates the wasm outputs

👟 Steps to reproduce

1. Create project with build script
2. Add wasm-pack as build-dependency
3. Use wasm-pack to compile the rust code

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: 0.12.1
rustc version: 1.79.0