using GIT_SSH to set credentials -
> /usr/bin/git ls-remote -h ssh://git@****.git docker # timeout=10
FATAL: hudson.plugins.git.GitException: Command "/usr/bin/git ls-remote -h ssh://git@****.git docker" returned status code 128:
stdout:
stderr: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

hudson.util.IOException2: hudson.plugins.git.GitException: Command "/usr/bin/git ls-remote -h ssh://git@****.git docker" returned status code 128:
stdout:
stderr: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

at hudson.plugins.git.GitSCM.compareRemoteRevisionWith(GitSCM.java:475)
at hudson.scm.SCM.poll(SCM.java:401)
at hudson.model.AbstractProject._poll(AbstractProject.java:1429)
at hudson.model.AbstractProject.poll(AbstractProject.java:1332)
at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:515)
at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:544)
at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: hudson.plugins.git.GitException: Command "/usr/bin/git ls-remote -h ssh://git@****.git docker" returned status code 128:
stdout:
stderr: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1437)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1225)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1138)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1129)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.getHeadRev(CliGitAPIImpl.java:2059)
at hudson.plugins.git.GitSCM.compareRemoteRevisionWithImpl(GitSCM.java:509)
at hudson.plugins.git.GitSCM.compareRemoteRevisionWith(GitSCM.java:473)
... 11 more
Done. Took 73 ms
No changes