Configuring for postman collection running

I’m attempting to configure my jenkins instance (docker jenkins/jenkins:llts-jdk11) to run postman collection tests via newman integration.
I’ve followed instructions on how to perform this with various instructional references, one of which like this but it doesn’t appear to be working. Looking at the logs I see this:

WARNING h.m.DownloadService$Downloadable#updateNow: No tool installer metadata found for

so I’m assuming it’s failing.
Attempting to create a job with a execute shell script with this in it:

node --version
newman --version

and getting this on test results:

Building in workspace /var/jenkins_home/workspace/test_two
[test_two] $ /bin/sh -xe /tmp/
+ node --version
/tmp/ 2: node: not found
Build step 'Execute shell' marked build as failure
Finished: FAILURE

any ideas on how to fix this? Assuming something is broken?