Outdated Docker Image

[ealvar3z]

Per the following:

💡 The following repositories are no longer updated:[ocaml/opam2⁠](https://hub.docker.com/r/ocaml/opam2),  
 [ocaml/opam2-staging⁠](https://hub.docker.com/r/ocaml/opam2-staging), [ocurrent/opam⁠] 
 (https://hub.docker.com/r/ocurrent/opam) and [ocaml/ocaml⁠](https://hub.docker.com/r/ocaml/ocaml).  
To get the latest  and greatest images use this repository (ocaml/opam).

I will do the PR to include support for podman users.