message: Add explaination on prototype beta in docker version script
diff: #!/bin/sh
  +# This script is ran whenever a PR is made to implement a Meilisearch prototype.
  +# For example if Meilisearch creates a prototype for radioactive search, the SDK may implement a way to try out the radioactive search.
  +# Nonetheless, the tests of this implentation should run against the prototype and not the latest release of Meilisearch.
  +# To be able to do so, Meilisearch creates a docker image with the changes.
  +# The purpose of this script is to find the correct docker image containing the changes.
  +# For example,
  +# The radioactive search docker image is named `v0.30.0-radioactive-search.beta.0`
  +# our branch is named `prototype/radioactive-search.0`
  +# Using the branch name, this script is going to retrieve the name of the docker image.
  +
  # See https://docs.github.com/en/actions/learn-github-actions/environment-variables#default-environment-variables for references on GITHUB_REF_NAME
  prototype_branch=$1 # $GITHUB_REF_NAME
  prototype_branch=$(echo $prototype_branch | sed -r 's/prototype-beta\///') # remove pre-prending prototype-beta/
  