gitlab-ci: add nightly testing jobs for Intel compilers on Linux
Add jobs testing all Intel Classic compiler versions from 2016 through 2021, and all Intel oneAPI compiler versions currently available in 2021.
System updates will be applied on Mar 27th between 7am and 9am, EST (UTC-05:00). This site will have intermittent downtime during that time.
Add jobs testing all Intel Classic compiler versions from 2016 through 2021, and all Intel oneAPI compiler versions currently available in 2021.