🚑 hotfix: add the missing environment variable for the unit tests

Author: ge85riz

backend/src/test/resources/application.properties

@@ -31,4 +31,6 @@ spring.security.oauth2.client.registration.gitlab.redirect-uri=http://localhost:
 spring.security.oauth2.client.registration.gitlab.scope=read_user
 spring.security.oauth2.client.registration.gitlab.client-name=GitLab
 spring.jackson.serialization.write-dates-as-timestamps=false
+constraint-solver.num-search-workers=1
+constraint-solver.solver-time-limit=300
 server.ssl.enabled=false