Let's use return instead of exit for errors

1 job for preprod in 2 seconds (queued for 2 seconds)
Name Stage Failure
preprod:deploy Preprod
  adding: scripts/install.sh (deflated 52%)
adding: site.env (deflated 41%)
adding: style.css (deflated 42%)
+ php /usr/local/bin/wp-cli.phar --path=/srv/wordpress/ theme install ./troisquatorze.zip --force --activate --url=https://troisquatorze.test
Error: Site 'troisquatorze.test' not found. Verify `--url=<url>` matches an existing site.
+ echo 'Oops install of troisquatorze.zip went bad'
Oops install of troisquatorze.zip went bad
./scripts/install.sh: ligne 40: « $PLUGIN » : identifiant non valable
ERROR: Job failed: exit status 1