[wanda] add podman backend

[andrew-anyscale]

adds podman backend via podman_cmd. Requires
having podman already installed + available via PATH

I still need to battletest this, but this is the
general shape!

Topic: add-podman-backend
Relative: refactor-for-podman

Signed-off-by: andrew [email protected]

[andrew-anyscale]

Reviews in this chain:
└#329 [wanda] refactor docker_cmd to be container_cmd
　└#330 [wanda] add podman backend

[andrew-anyscale]

#	head	base	diff	date	summary
0	afe8d89b	cbee1681	diff	Dec 19 1:33 AM	6 files changed, 85 insertions(+), 3 deletions(-)
1	221e0934	cbee1681	diff	Dec 19 2:22 AM	3 files changed, 43 insertions(+), 16 deletions(-)
2	eae75ffb	b521b0f0	rebase	Dec 19 2:26 AM	0 files changed

[gemini-code-assist]

Summary of Changes

Hello @andrew-anyscale, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the wanda project's flexibility by adding comprehensive support for Podman as a container runtime. It involves integrating Podman-specific command execution, error handling, and environment setup, alongside a new command-line option for users to choose between Docker and Podman. This change aims to provide users with more choices for their containerization needs.

Highlights

• Podman Backend Integration: Introduced a new backend for Podman, allowing it to be used as an alternative container runtime to Docker.
• Podman Error Handling: Modified the inspectImage function to correctly handle Podman's specific exit code (125) when an image is not found, preventing false errors.
• Podman Availability Check: Updated the podmanAvailable utility function to accurately check for the presence of the Podman executable in the system's PATH.
• Dynamic Container Runtime Selection: Enhanced the newContainerCmd factory function to dynamically create either a Docker or Podman command instance based on the configured ContainerRuntime.
• New Podman Command Implementation: Added a dedicated podman_cmd.go file which encapsulates the logic for executing Podman commands and managing relevant environment variables.
• CLI Flag for Podman: Implemented a new command-line flag --podman in the main application to explicitly select Podman as the desired container runtime.

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[gemini-code-assist]

Code Review

This pull request adds support for using Podman as a container backend, which is a great addition. The implementation is straightforward and follows the existing structure for the Docker backend. I've made a few suggestions to improve code clarity, maintainability, and testing. Specifically, I've recommended refactoring the new tests to be table-driven, improving how environment variables are handled for Podman, and renaming a command-line flag for better user experience. Overall, this is a solid contribution.

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