fix: ensure we can execute run commands when exec is executed as part of an entrypoint

Closes #8052

plugins/scheduler-docker-local/scheduler-run

@@ -109,7 +109,8 @@ trigger-scheduler-docker-local-scheduler-run() {
     if [[ -n "$PROC_CMD" ]]; then
       dokku_log_info1_quiet "Found '$POTENTIAL_PROCFILE_KEY' in Procfile, running that command"
       DOCKER_ARGS+=" --label=com.dokku.process-type=$POTENTIAL_PROCFILE_KEY"
-      set -- "$PROC_CMD" "${@:2}"
+      read -ra proc_array <<<"$PROC_CMD"
+      set -- "${proc_array[@]}" "${@:2}"
     fi
   fi