Error: Command failed: docker image list --format '{{ if ne .Repository "<none>" }}{{ .Repository }}{{ if ne .Tag "<none>" }}:{{ .Tag }}{{ end }}{{ else }}{{ .ID }}{{ end }}' error during connect: Head "http://docker.example.com/_ping": command [ssh -o ConnectTimeout=30 -l github-actions -- 20.120.168.133 docker system dial-stdio] has exited with exit status 255, please make sure the URL is valid, and Docker 18.09 or later is installed on the remote host: [email protected]: Permission denied (publickey).