fix: fix bash syntax error when running run_macaron.sh on MacOS

[nathanwn]

The bash pattern matching syntax @(...) requires the shopt option extglob to be set. Although this option is set by default on newer versions of bash, it is not always the case. One known case is on MacOS, where the default bash version is bash 3.2. (even on the latest version of MacOS).

Reproduction: Run the following bash script in the bash:3.2 docker container.

#!/usr/bin/env bash

if [[ "${DOCKER_PULL}" != @(always|missing|never) ]]; then
    echo "DOCKER_PULL must be one of: always, missing, never (default: always)"
    exit 1
fi

[behnazh-w]

It's good to add shopt -s extglob for older versions of bash, but we should add a requirement for the bash version for running run_macaron.sh. In general running old bash versions is not a good idea for security reasons, etc. and it's better if people upgrade their bash version. Can you please add a check for the bash version and "recommend" to update it if it's below our supported version?

[nathanwn]

It's good to add shopt -s extglob for older versions of bash, but we should add a requirement for the bash version for running run_macaron.sh. In general running old bash versions is not a good idea for security reasons, etc. and it's better if people upgrade their bash version. Can you please add a check for the bash version and "recommend" to update it if it's below our supported version?

I have added a warning in efccf1d.

[nathanwn]

A note about bash version has been added to our installation instructions in cd73e23.