CI: Fix APT installation command.
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 58235ed..7640bc3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,7 +7,7 @@
   stage: check
   script:
     - apt-get update
-    - apt-get -y --no-install-recommends yarn
+    - apt-get -y --no-install-recommends install yarn
     - mvn verify
 
 sast: