[swan-cern] Sidecar container needs to run as root

When using the swan-cern user image, by default jovyan is used.
This commits forces the use of root.

swan-cern/files/swan_config_cern.py

@@ -12,6 +12,7 @@
     V1ObjectMeta,
     V1Secret,
     V1SecretVolumeSource,
+    V1SecurityContext,
     V1Volume,
     V1VolumeMount,
 )
@@ -200,7 +201,8 @@ def _init_eos_containers(self, eos_secret_name):
                     env['USER_ID'],
                     str(swan_cull_period)
                 ],
-                volume_mounts=side_container_volume_mounts
+                volume_mounts=side_container_volume_mounts,
+                security_context=V1SecurityContext(run_as_user=0)
             )
         )