library/roles/letsencrypt-client: Install the official letsencrypt client. No automation for now.

d4science-ghn-cluster/roles/haproxy_frontend: default repository for Ubuntu.
d4science-ghn-cluster/infra-gateway.yml: Install haproxy.

letsencrypt-client/defaults/main.yml

@@ -0,0 +1,9 @@
+---
+letsencrypt_install: False
+letsencrypt_git_repo: 'https://github.com/letsencrypt/letsencrypt'
+letsencrypt_dest_dir: /opt
+letsencrypt_update_repo: True
+letsencrypt_prerequisites:
+  - git
+  - bc
+

letsencrypt-client/tasks/main.yml

@@ -0,0 +1,14 @@
+---
+- name: Install the letsencrypt package dependencies
+  apt: name={{ item }} state=present
+  with_items: '{{ letsencrypt_prerequisites }}'
+  when: letsencrypt_install
+  tags: letsencrypt
+
+- name: Get the letsencrypt client
+  git: repo={{ letsencrypt_git_repo }} dest={{ letsencrypt_dest_dir }}/letsencrypt update={{ letsencrypt_update_repo }}
+  with_items: '{{ letsencrypt_prerequisites }}'
+  when: letsencrypt_install
+  tags: letsencrypt
+
+