Use mac keychain for credentials

# Use macOS Keychain for Docker/Podman Credentials

## Description
Currently, Docker and Podman credentials are stored in plain text or in default credential stores. This is not secure for macOS users. The goal is to integrate macOS Keychain for storing and retrieving Docker/Podman credentials securely.

## Requirements
- Configure Docker to use macOS Keychain as the credential store.
- Configure Podman to use macOS Keychain if possible.
- Ensure that login credentials are retrieved automatically when needed.
- Provide clear instructions for setup and usage.

## Benefits
- Improved security for credentials.
- Seamless login experience without storing plain text passwords.
- Better alignment with macOS security best practices.

## References
- [Docker Credential Helpers](https://docs.docker.com/engine/reference/commandline/login/#credentials-store)
- [Podman Credential Stores](https://podman.io/docs/)

## Tasks
- [ ] Research Podman macOS Keychain integration.
- [ ] Update Docker config to use Keychain.
- [ ] Test credential retrieval for both Docker and Podman.
- [ ] Document setup steps in README.