[Bug]: relative path in 'entrypoint' is not accepted

[BatmanAoD]

I have done the following

• I have searched the existing issues
• If possible, I've reproduced the issue using the 'main' branch of this project

(Sorry for not trying the main branch; I don't have a swift toolchain set up at the moment.)

(Note: this should possibly be categorized as a feature request rather than a bug; I wasn't sure.)

Steps to reproduce

Run any image that users a relative path as an entrypoint, or explicitly specify a relative path in the --entrypoint argument.

As an example:

container run -w /usr/local/cargo/bin --entrypoint ./rustc rust:latest --version

Current behavior

This error is printed:

Error: internalError: "failed to find target executable ./rustc"

Expected behavior

This should run the rustc binary at /usr/local/cargo/bin/rustc, and print a version string. With podman or docker:

> podman run -w /usr/local/cargo/bin --entrypoint ./rustc rust:latest --version
rustc 1.92.0 (ded5c06cf 2025-12-08)

Environment

- OS: macOS 26.1
- Xcode: (not installed)
- Container: container CLI version 0.7.1 (build: release, commit: 420be74)

Relevant log output

N/A

Code of Conduct

• I agree to follow this project's Code of Conduct

[dcantah]

Can fix, we'll definitely want this.