tuto: correct syntax error

2 jobs for tuto-2020 in 9 seconds
Status Job ID Name Coverage
  Test Tools
passed #772778
test_tools

00:00:09

 
  Test Quality
failed #772779
allowed to fail
code_quality

00:00:05

 
Name Stage Failure
failed
code_quality Test Quality
$ if ! docker info &>/dev/null; then # collapsed multi-line command
$ docker pull --quiet "$CODE_QUALITY_IMAGE"
unknown flag: --quiet
See 'docker pull --help'.
Uploading artifacts...
Runtime platform arch=386 os=linux pid=3058 revision=58272c27 version=12.7.0
WARNING: gl-code-quality-report.json: no matching files
ERROR: No files to upload
ERROR: Job failed: exit status 1