bundles/docker-engine: turns out, filtering by name means getting everything where the name contains the filter ...

bundles/docker-engine/files/check_docker_container

@@ -18,7 +18,13 @@ try:
         f'name={container_name}'
     ])
 
-    containers = loads(f"[{','.join([l for l in docker_ps.decode().splitlines() if l])}]")
+    docker_json = loads(f"[{','.join([l for l in docker_ps.decode().splitlines() if l])}]")
+
+    containers = [
+        container
+        for container in docker_json
+        if container['Names'] == container_name
+    ]
 
     if not containers:
         print(f'CRITICAL: container {container_name} not found!')