apt: use conditionnal instead of handler for update

apt/handlers/main.yml

@@ -1,4 +0,0 @@
----
-- name: apt update
-  apt:
-    update_cache: yes

apt/tasks/backports.yml

@@ -13,7 +13,7 @@
     dest: /etc/apt/sources.list.d/backports.list
     force: yes
     mode: "0640"
-  notify: apt update
+  register: apt_backports_list
   tags:
   - apt
 
@@ -23,11 +23,13 @@
     dest: /etc/apt/preferences.d/0-backports-defaults
     force: yes
     mode: "0640"
-  notify: apt update
+  register: apt_backports_config
   tags:
   - apt
 
-- name: Intermediate flush of handlers
-  meta: flush_handlers
+- name: Apt update
+  apt:
+    update_cache: yes
+  when: apt_backports_list | changed or apt_backports_config | changed
   tags:
   - apt

apt/tasks/basics.yml

@@ -6,7 +6,7 @@
     dest: /etc/apt/sources.list
     mode: "0644"
     force: yes
-  notify: apt update
+  register: apt_basic_list
   tags:
   - apt
 
@@ -20,7 +20,9 @@
   - /etc/apt/sources.list.d/debian-update.list
   when: apt_clean_gandi_sourceslist
 
-- name: Intermediate flush of handlers
-  meta: flush_handlers
+- name: Apt update
+  apt:
+    update_cache: yes
+  when: apt_basic_list | changed
   tags:
   - apt

apt/tasks/evolix_public.yml

@@ -19,11 +19,13 @@
     dest: /etc/apt/sources.list.d/evolix_public.list
     force: yes
     mode: "0640"
-  notify: apt update
+  register: apt_evolix_public
   tags:
   - apt
 
-- name: Intermediate flush of handlers
-  meta: flush_handlers
+- name: Apt update
+  apt:
+    update_cache: yes
+  when: apt_evolix_public | changed
   tags:
   - apt