[gnome-shell] ci: Include git in extension-ci image

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 8ea6fd19258593d71ac65e41459ce203c5aa9b9a
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Jul 4 17:35:48 2019 +0200

    ci: Include git in extension-ci image
    
    It's useful for anything that does not want to limit itself to the
    checked out branch, like comparing source and target branch.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/627

 .gitlab-ci/Dockerfile.extension-ci | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci/Dockerfile.extension-ci b/.gitlab-ci/Dockerfile.extension-ci
index 228355475..6ec6aff9f 100644
--- a/.gitlab-ci/Dockerfile.extension-ci
+++ b/.gitlab-ci/Dockerfile.extension-ci
@@ -1,7 +1,7 @@
 FROM registry.fedoraproject.org/fedora:latest
 
 RUN dnf -y update && dnf -y upgrade && \
-    dnf install -y 'dnf-command(copr)' && \
+    dnf install -y 'dnf-command(copr)' git && \
 
     # For syntax checks with `find . -name '*.js' -exec js60 -c -s '{}' ';'`
     dnf install -y findutils mozjs60-devel && \