always use bionic url

tasks/install.yml

 ---
+- name: install apt key
+  apt_key:
+    state: present
+    keyserver: 'https://keyserver.ubuntu.com'
+    id: 'CFFB779AADC995E4F350A060505D97A41C61B9CD'
 
 - name: Add HAProxy 2.0 PPA
   apt_repository:
-    repo: 'ppa:vbernat/haproxy-2.0'
+    repo: "deb http://ppa.launchpad.net/vbernat/haproxy-2.0/ubuntu bionic main"
     state: present
 
-- name: Remove HAProxy 1.8 PPA
-  apt_repository:
-    repo: 'ppa:vbernat/haproxy-1.8'
-    state: absent
-
 - name: Install HAProxy
   apt:
     name: "haproxy=2.0.*"