Add sftp strict host key checking to DFC in 5G-bulkpm test

Issue-ID: DCAEGEN2-2219
Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
Change-Id: Ie616b5a3ac4228442bc0623d28f0d9c560fde696
diff --git a/plans/usecases-5G-bulkpm/5G-bulkpm/composefile/docker-compose-e2e.yml b/plans/usecases-5G-bulkpm/5G-bulkpm/composefile/docker-compose-e2e.yml
index e2f16a7..dff4824 100644
--- a/plans/usecases-5G-bulkpm/5G-bulkpm/composefile/docker-compose-e2e.yml
+++ b/plans/usecases-5G-bulkpm/5G-bulkpm/composefile/docker-compose-e2e.yml
@@ -110,6 +110,8 @@
       tmp_bulk-pm-network:
         aliases:
           - dcaegen2-datafile-collector
+    environment:
+      KNOWN_HOSTS_FILE_PATH: "/home/datafile/.ssh/known_hosts"
 
   cbs-sim:
     container_name: config-binding-service-sim