Add Jenkins public SSH key for Integration env
Add Jenkins public SSH key for Integration env

This is a newly generated key copied from
`/var/lib/jenkins/.ssh/id_rsa.pub` on jenkins-1.management in the new
Integration environment.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet