jenkins: move simulator build into lock

old-commit-hash: add335d9e6

Jenkinsfile

@@ -88,8 +88,8 @@ pipeline {
           steps {
             sh "git config --global --add safe.directory ${WORKSPACE}"
             sh "git lfs pull"
-            sh "${WORKSPACE}/tools/sim/build_container.sh"
             lock(resource: "", label: "simulator", inversePrecedence: true, quantity: 1) {
+              sh "${WORKSPACE}/tools/sim/build_container.sh"
               sh "DETACH=1 ${WORKSPACE}/tools/sim/start_carla.sh"
               sh "${WORKSPACE}/tools/sim/start_openpilot_docker.sh"
             }