Pass additional arguments to build commands

[f4z3r]

Relates-to:

Feature or Problem

Allow to pass additional arguments to build systems on the build command.

Related Issues

#60

Release Information

Next

Consumer Impact

None.

Testing

Unit Test(s)

Acceptance or Integration

Added a --release flag in one of the integration tests.

Manual Verification

Built a custom component with additional flags:

$ wash build --skip-fetch
2025-10-08T07:18:20.092760Z  INFO building component path="."
2025-10-08T07:18:53.052954Z  INFO cargo build --target wasm32-wasip2 --color always completed in 32.96s
2025-10-08T07:18:53.054584Z  INFO Generated project configuration at ./.wash/config.json
Successfully built component at: <redacted>

$ wash build --skip-fetch . -- --release
2025-10-08T07:19:36.695847Z  INFO building component path="."
2025-10-08T07:19:36.908974Z  INFO cargo build --target wasm32-wasip2 --color always --release completed in 0.21s
Successfully built component at: <redacted>

We can see that the --release flag was correctly passed to cargo.