Update .gitlab-ci.yml: pull el7 container from containers.ligo.org

14 jobs for master in 16 minutes and 58 seconds (queued for 13 minutes and 44 seconds)
Status Job ID Name Coverage
  Build
passed #1069641
build:debian:buster

00:01:13

passed #1069640
build:debian:stretch

00:01:21

passed #1069639
build:el7

00:00:48

passed #1069638
build:tarball

00:00:20

 
  Test
passed #1069646
docs

00:00:52

passed #1069647
syntax

00:00:36

passed #1069642
test:python2.7

00:00:44

75.0%
passed #1069643
test:python3.6

00:00:31

75.0%
passed #1069644
test:python3.7

00:00:31

75.0%
passed #1069645
test:python3.8

00:00:54

75.0%
 
  Integration
passed #1069648
integration:python2.7

00:04:26

passed #1069649
integration:python3.6

00:03:32

passed #1069650
integration:python3.7

00:03:21

passed #1069651
integration:python3.8

00:03:22