Deploy code from private repositories through Tower

[acozine]

User story

As a DACS team member, I would like to be able to deploy the EZproxy config repo from Tower so that my colleagues can see when it was deployed and what the outcome was.

Acceptance criteria

• I can select ezproxy from the list of repositories in the cap deploy template, and the latest code gets deployed from Tower.
• Stretch goal: selected library staff outside of the IT group can also deploy ezproxy config changes.

Implementation notes, if any

We once had something similar for the pas project. See

princeton_ansible/roles/pas_code/tasks/main.yml

Line 9 in 07e4f5a

key_file: '/home/deploy/.ssh/id_rsa'

.