[gnome-flashback] ci: use $GITLAB_USER_EMAIL

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 698b49c39003b38c47ffd1b4419e72f296f62662
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Apr 24 18:52:04 2021 +0300

    ci: use $GITLAB_USER_EMAIL

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2acd51a..a57c513 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -91,7 +91,7 @@ coverity:
     - ./cov-analysis-linux64-*/bin/cov-build --dir cov-int make
     - tar czf cov-int.tar.gz cov-int
     - curl --form token=$COVERITY_TOKEN
-      --form email=alberts muktupavels gmail com
+      --form email=$GITLAB_USER_EMAIL
       --form file=@cov-int.tar.gz
       --form version="$(autoconf --trace='AC_INIT:$2')-$CI_COMMIT_SHORT_SHA"
       https://scan.coverity.com/builds?project=gnome-flashback