Fix slurm: launch to only 1 node

src/dgenies/lib/job_manager.py

@@ -537,7 +537,7 @@ class JobManager:
         native_specs = self.config.drmaa_native_specs
         if batch_system_type == "slurm":
             if native_specs == "###DEFAULT###":
-                native_specs = "--mem-per-cpu={0} --ntasks={1} --time={2}"
+                native_specs = "--mem-per-cpu={0} --mincpus={1} -N 1 --time={2}"
             if step == "prepare":
                 jt.nativeSpecification = native_specs.format(memory, 1, "02:00:00")
             elif step == "start":