add a role to include the hpcid CA in the ssh keys

Former-commit-id: a40821a7

roles/hpcid_ca/tasks/main.yml

+---
+
+- name: ensure hpcid_ca is in the authorized_keys file
+  authorized_key: user={{ ansible_user }} key="cert-authority ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCfHlWGrnpirvqvUTySnoQK6ze5oIXz7cYIT+XCBeBCahlK05O38g0erBGrNWFozZwbIXnysVCibaUJqtH0JrYqmcr2NnYA0PoiTeranvaJI7pQsga1gBxfK/D4UItw5yI6V7w9efMT0zpIP8WEubQz6GFtkyiNVgFCHj3+VhLs3RslvYzb35SFcLXEDsGVQM5NdWBUgRaNRqpTPvuMcxTyPvy32wW72kwaYRQioDJFcE2WJ240M2oSsx+dhTWvI8sW1sEUI1qIDfyBPsOgsLofuSpt4ZNgJqBUTp/hW85wVpNzud6A4YJWHpZXSDMtUMYE9QL+x2fw/b26yck9ZPE/ hines@tun"