Add grep to container basic dependencies

[dsalaza4]

When using GitLab CI, the base step_script requires grep to validate the following condition:

if set -o | grep pipefail > /dev/null; then set -o pipefail; fi; set -o errexit

It fails when using the Makes contianer with:

/scripts-20741933-3770428206/step_script: line 13: grep: command not found

Let's add grep to the container as it is a basic utility.