Add nightly capability into the CI automation infrastructure

[TerrenceMcGuinness-NOAA]

What new functionality do you need?

As a branch manager we need to add a functionality into the automated continuous integration process to run tests on a nightly basis as opposed to the current per PR basis.

What are the requirements for the new functionality?

• We will need to have a new directory located in the cases directory for which test should be run on a nightly basis.
• The yaml files in the is nightly directory should be able to process on the CTest/Functional tests as well as the full Experiment tests.
• Failures should be e-mailed to the CM and Product Owner
• The tests should not be deleted after the run and then removed systematically on demand

Acceptance Criteria

• Two days of successful executions of the nightly tests should run to include pass and fail examples
• Notifications are acknowledged by CM and the CM should be able to easly review the results and delete them

Suggest a solution (optional)

Use GitLab perfably, fall back on Jenkins or Cron if GitLab does not overcome the current blockers