add JWT secret ENV

.gitlab-ci.yml

@@ -17,6 +17,7 @@ variables:
   SKIP_PREFLIGHT_CHECK: "true"
   INITIAL_COORDINATOR_EMAIL: "initial@fahrtenbuch.example"
   INITIAL_COORDINATOR_PASSWORD: "password"
+  JWT_SECRET: "RANDOM_SECRET_HARD_TO_GUESS"
 
 
 # These folders and files are cached between builds