[libsoup] docker: Add gnutls-devel

[Patrick Griffis <pgriffis src gnome org>]

commit f06b68d0d2b37f961e278cee12b0d4a17fdf36d9
Author: Patrick Griffis <pgriffis igalia com>
Date:   Tue Apr 27 18:39:52 2021 -0500

    docker: Add gnutls-devel

 .gitlab-ci/Dockerfile | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci/Dockerfile b/.gitlab-ci/Dockerfile
index 1c32fa5c..702402e7 100644
--- a/.gitlab-ci/Dockerfile
+++ b/.gitlab-ci/Dockerfile
@@ -8,6 +8,7 @@ RUN dnf update -y \
                       clang-analyzer \
                       git \
                       glib2-doc \
+                      gnutls-devel \
                       gtk-doc \
                       httpd \
                       lcov \