Install lockable-resources plugin
diff --git a/Dockerfile b/Dockerfile
index c09c453..26e403c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -91,6 +91,7 @@
         git \
         heavy-job \
         ldap \
+        lockable-resources \
         matrix-auth \
         monitoring \
         permissive-script-security \