add haproxy repo, custom config files & readme

tasks/install_from_haproxy.yml

@@ -0,0 +1,20 @@
+---
+- name: haproxy | add HAProxy Debian repository key
+  ansible.builtin.get_url:
+    url: "{{ haproxy_debian_repo_key_url }}"
+    dest: /etc/apt/keyrings/haproxy-archive-keyring.gpg
+    mode: '0644'
+
+- name: haproxy | add HAProxy Debian repository
+  ansible.builtin.apt_repository:
+    repo: "deb [signed-by=/etc/apt/keyrings/haproxy-archive-keyring.gpg] {{ haproxy_debian_repo_url }} {{ haproxy_debian_repo_distribution }}-backports-{{ haproxy_version }} {{ haproxy_debian_repo_component }}"
+    state: present
+    filename: 'haproxy'
+    update_cache: yes
+
+- name: haproxy | install HAProxy from HAProxy Debian repo
+  ansible.builtin.apt:
+    name: haproxy
+    state: present
+    update_cache: yes
+    default_release: "{{ haproxy_debian_repo_distribution }}-backports-{{ haproxy_version }}"