Get 'No JSON object could be decoded' when running tank with overload plugin

[Kirill380]

Get next error:

15:49:14 [INFO] Preparing test...
15:49:14 [INFO] Checking tank resources...
15:49:14 [INFO] Using OVERLOAD backend
15:49:14 [INFO] Read authentication token from /var/loadtest/token.txt, token length is 32 bytes
15:49:14 [INFO] Proxy not set
15:49:14 [INFO] Detected target: somehost.com
15:49:14 [WARNING] Failed to create job on lunapark
15:49:14 [WARNING] ValueError('No JSON object could be decoded',)
15:49:14 [ERROR] 
15:49:14 [ERROR] Failed to connect to Lunapark, disabling DataUploader

When run yandex tank inside docker with overload integration.

Here's the config

overload:
  enabled: true
  operator: Kirill
  package: yandextank.plugins.DataUploader
  token_file: "/var/loadtest/token.txt"
  job_name: Test
  job_dsc: Basic load scenario

And a run command:

docker run \
    -v $(pwd):/var/loadtest \
    -v $SSH_AUTH_SOCK:/ssh-agent -e SSH_AUTH_SOCK=/ssh-agent \
    --net host \
    -it direvius/yandex-tank