GitLab CI/CD - Pipeline gets stuck when using Runner on my own Host

I've setup CI/CD on GitLab for my toy project. After installing the Runner on my own host and activating it for my project, I double-checked everything by

1. running gitlab-runner verify and got the result

2. On GitLab, I got the result after finishing the registration step (gitlab-runner register)

The content in config file for GiLab Runner is as following

concurrent = 1
check_interval = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "localhost"
  url = "https://gitlab.com/"
  token = MyTokenProvidedByGitLab
  executor = "ssh"
  [runners.custom_build_dir]
  [runners.ssh]
    user = "root"
    host = "MyHost.org"
    port = "22"
    identity_file = "/d/ssh/id_rsa"
  [runners.cache]
    [runners.cache.s3]
    [runners.cache.gcs]

However, the pipeline gets stuck

Furthermore, I also executed the command gitlab-runner run to try making the pipeline run, but it seems to not work, below is the picture

Is there anything wrong in my setup steps?