CI jobs for postmortem group

[mhdawson]

Setting up initial jobs for post-mortem WG in #594

To allow members of the postmortem WG to be able to run/configure these jobs plan to set up as per https://github.com/nodejs/build/blob/master/doc/process/jenkins_job_configuation_access.md

Unless there are objects this would be the plan:

• create a new team called post-mortem-admins who will be able to modify/configure jobs. There is already
  an existing team called 'post-mortem' with the members actively contributing to the work.
• Add the members who will be working to configure the ci jobs to post-mortem-admins
• Modify job setup under Add CI to run nodereport tests #594 so that it can be accessed by those in the post-mortem and post-mortem-admins team

@nodejs/build let me know if there are any objections.

[gibfahn]

SGTM, but we should make sure this is documented (probably in the post-mortem repo README).

[mhdawson]

@gibfahn is there the plan to do the equivalent for citgm. If so I'd like to just copy the text to do what we need for the post-mortem README.

[mhdawson]

teams created, added Richard C to admin team initially as I think he'll be the first person from the post-mortem team that may need to modify the post-mortem jobs. The post-mortem WG can add additional people as needed.

[mhdawson]

Jobs are in place, just leaving this open until we close on the doc. @gibfahn @gdams can one of you update the CITGM readme to doc the jobs used there and then I'll replicate that to the node-report repo.

[maclover7]

Job was created: https://ci.nodejs.org/view/post-mortem/job/nodereport-continuous-integration/