[new release] dockerfile-opam, dockerfile and dockerfile-cmd (7.1.0)
CHANGES:
- Add ArchLinux support (@kit-ty-kate avsm/ocaml-dockerfile#23)
- Move Alpine 3.11 to deprecated (@kit-ty-kate avsm/ocaml-dockerfile#23).
- Add OracleLinux v8 (@kit-ty-kate avsm/ocaml-dockerfile#24)
- Add Ubuntu 20.10 and Fedora 33 (@avsm)
- Make Alpine 3.13 and Fedora 33 the latest versions.
- Update the latest versions of Ubuntu LTS to 20.04
and CentOS to 8 and OracleLinux to 8 (@avsm)
- Activate Powertools for CentOS 8 (@kit-ty-kate avsm/ocaml-dockerfile#26)
- Build aarch64 images for Fedora 33 and higher as well (@avsm).
- Remove outdated bulk-build and archive functions from
`Dockerfile_opam` (@avsm)
- Create a Tier 3 for distros for things we do not want
to test in the opam repository (@avsm @kit-ty-kate)