migrate from docker to podman on macos

docker to podman migration bash script on macos:

1. bash fly-to-podman.sh images
2. bash fly-to-podman.sh networks (not sure if necessary)
3. bash docker-to-podman.sh --volumes-only
4. bash docker-to-podman.sh --containers-only
5. alias docker=podman

Acknowledgments

fly-to-podman.sh is copied from: https://github.com/Edu4rdSHL/fly-to-podman