Latest version of gromacs in docker

GROMACS version:
GROMACS modification: Yes/No
I am trying to run GROMACS on the cloud and I made a pull request for the docker image. The latest version I am able to obtain this way is 2020.2. However, there is now a newer version available 2021.2. How could I obtain this version through docker? I tried putting a version number tag, but I get an error for anything that is newer than 2020.2.