add test for interacting with a swarm stack

test/default/run.sh

@@ -13,12 +13,14 @@ docker run --rm -it \
   -v default_backup_data:/data alpine \
   ash -c 'tar -xf /data/backup/test.tar.gz && test -f /backup/app_data/offen.db'
 
+echo "[TEST:PASS] Found relevant files in untared backup."
+
 if [ "$(docker-compose ps -q | wc -l)" != "3" ]; then
-  echo "Expected all containers to be running post backup, instead seen:"
+  echo "[TEST:FAIL] Expected all containers to be running post backup, instead seen:"
   docker-compose ps
   exit 1
 fi
 
-docker-compose down --volumes
+echo "[TEST:PASS] All containers running post backup."
 
-echo "Test passed"
+docker-compose down --volumes