Merge branch 'schedule_the_pipeline_to_run_every_night' into 'dev'

Update .gitlab-ci.yml

See merge request !59
3 jobs for dev in 240 minutes and 32 seconds (queued for 8 seconds)
Name Stage Failure
failed
notebooks_exec Test The script exceeded the maximum execution time set for the job

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============================= test session starts ==============================
platform linux -- Python 3.8.6, pytest-6.2.5, py-1.11.0, pluggy-1.0.0
rootdir: /builds/LHCData/lhc-sm-hwc
plugins: forked-1.3.0, xdist-2.3.0, hypothesis-5.3.0, typeguard-2.7.0
gw0 I / gw1 I / gw2 I / gw3 I
gw0 [66] / gw1 [66] / gw2 [66] / gw3 [66]

...................F............................................
ERROR: Job failed: execution took longer than 4h0m0s seconds