refactor!: switch hosts variables to a flat layout

collections/ansible_collections/nullified/infrastructure/roles/common/tasks/main.yml

@@ -1,9 +1,4 @@
 ---
-- name: '[setup] merge with custom vars'
-  ansible.builtin.set_fact:
-    common: "{{ common | combine(custom_common, recursive=recursive_combine) }}"
-  changed_when: false
-
 - name: '[system] setup DNS server'
   block:
     - name: disable resolv.conf updates from dhclient
@@ -25,7 +20,7 @@
         owner: root
         group: root
   become: true
-  when: common.configure_resolv_conf is truthy
+  when: common_configure_resolve_conf is truthy
 
 - name: '[system] re-allow DHCP client to setup DNS resolvers'
   become: true
@@ -33,7 +28,7 @@
     path: /etc/dhcp/dhclient-enter-hooks.d/nodnsupdate
     state: absent
   failed_when: false
-  when : common.configure_resolv_conf is falsy
+  when : common_configure_resolve_conf is falsy
 
 - name: '[apt] verify components of default sources'
   become: true
@@ -43,15 +38,15 @@
         path: '/etc/apt/sources.list'
         regexp: '^(deb((?!{{ item }}).)+)$'
         replace: '\1 {{ item }}'
-      when: not common.apt.deb822_format | bool
-      loop: '{{ common.apt.source_components }}'
+      loop: '{{ common_apt_source_components }}'
+      when: common_apt_use_deb822_format is falsy
     - name: '[apt] default deb822 debian.sources'
       ansible.builtin.replace:
         path: '/etc/apt/sources.list.d/debian.sources'
         regexp: '^(Components: ((?!{{ item }}).)+)$'
         replace: '\1 {{ item }}'
-      loop: '{{ common.apt.source_components }}'
-      when: common.apt.deb822_format | bool
+      loop: '{{ common_apt_source_components }}'
+      when: common_apt_use_deb822_format is truthy
 
 - name: '[apt] install dependencies and tools'
   become: true
@@ -98,7 +93,7 @@
     asset_type: "{{ item.asset_type }}"
     cmds: "{{ item.cmds | default([]) }}"
     creates: "{{ item.creates | default('') }}"
-    github_token: "{{ common.github_token }}"
+    github_token: "{{ common_github_token }}"
     repository: "{{ item.repository }}"
     version: "{{ item.version | default('') }}"
   loop:
@@ -144,9 +139,9 @@
     src: ../templates/system/sysctld.local.conf.j2
     dest: /etc/sysctl.d/local.conf
     mode: '0644'
-  when: common.sysctl is truthy
+  when: common_sysctl_configuration is truthy
   vars:
-    sysctl_values: "{{ common.sysctl }}"
+    sysctl_values: "{{ common_sysctl_configuration }}"
   notify:
     - 'common : [system] reload sysctl configuration'
 
@@ -156,8 +151,7 @@
     update_cache: true
     force_apt_get: true
     cache_valid_time: 3600
-    pkg:
-      "{{ common.apt.packages }}"
+    pkg: "{{ common_apt_packages }}"
 
 - include_tasks: home_setup.yml