Use Ansible ternary operator instead of J2 conditionals

Author: alessfg

defaults/main.yml

@@ -15,12 +15,12 @@ install_from: nginx_repository
 # Defaults are the official NGINX repositories.
 nginx_repository:
   debian:
-    - 'deb https://nginx.org/packages/{{ "mainline/" if branch == "mainline" }}{{ ansible_distribution|lower }}/ {{ ansible_distribution_release }} nginx'
-    - 'deb-src https://nginx.org/packages/{{ "mainline/" if branch == "mainline" }}{{ ansible_distribution|lower }}/ {{ ansible_distribution_release }} nginx'
+    - deb https://nginx.org/packages/{{ (branch == 'mainline') | ternary('mainline/','') }}{{ ansible_distribution|lower }}/ {{ ansible_distribution_release }} nginx
+    - deb-src https://nginx.org/packages/{{ (branch == 'mainline') | ternary('mainline/','') }}{{ ansible_distribution|lower }}/ {{ ansible_distribution_release }} nginx
   redhat:
-    - https://nginx.org/packages/{{ "mainline/" if branch == "mainline" }}{{ (ansible_distribution == "RedHat") | ternary('rhel/', 'centos/') }}{{ ansible_distribution_major_version|int }}/$basearch/
+    - https://nginx.org/packages/{{ (branch == 'mainline') | ternary('mainline/','') }}{{ (ansible_distribution == "RedHat") | ternary('rhel/', 'centos/') }}{{ ansible_distribution_major_version|int }}/$basearch/
   suse:
-    - https://nginx.org/packages/{{ "mainline/" if branch == "mainline" }}sles/12
+    - https://nginx.org/packages/{{ (branch == 'mainline') | ternary('mainline/','') }}sles/12
 
 # Specify which branch of NGINX Open Source you want to install.
 # Options are 'mainline' or 'stable'.