Rotate Automate-installed Chef Infra Server pivotal key

Problem: I would like to rotate the pivotal key on an Automate-installed Chef Server.

Solution:

# make sure existing key works, If not, stop here, do not continue
chef-server-ctl org-list

# backup existing pivotal.pem
cp /hab/svc/automate-cs-oc-erchef/data/pivotal.pem pivotal.pem.backup

# generate new pivotal.pem and then replace old key on disk
# needs to be two step process, '>' will erase `pivotal.pem` before `chef-server-ctl` can read it and causing it to fail cause it can't authenticate to the Chef Infra Server API.
chef-server-ctl add-user-key pivotal -k pivotal-`date +%s` > pivotal.pem

cp pivotal.pem /hab/svc/automate-cs-oc-erchef/data/pivotal.pem

# check that the new key works
chef-server-ctl org-list