mysql: move passwordstore lookup from tasks to variables

mysql/defaults/main.yml

+---
+
+# yamllint disable-line rule:line-length
+mysql_root_password: "{{ lookup('passwordstore', 'db/{{ ansible_hostname }}-mysql create=true length=20') }}"

mysql/tasks/main.yml

@@ -37,11 +37,9 @@
 - name: ensure the mysql root user exists and has the correct password
   mysql_user:
     name: root
-    # yamllint disable-line rule:line-length
-    password: "{{ lookup('passwordstore', 'db/{{ ansible_hostname }}-mysql create=true length=20') }}"
+    password: "{{ mysql_root_password }}"
     login_user: root
-    # yamllint disable-line rule:line-length
-    login_password: "{{ lookup('passwordstore', 'db/{{ ansible_hostname }}-mysql create=true length=20') }}"
+    login_password: "{{ mysql_root_password }}"
   register: mysql_root_creation_result
   no_log: true
   ignore_errors: true
@@ -52,8 +50,7 @@
 - name: initialize the mysql root user
   mysql_user:
     name: root
-    # yamllint disable-line rule:line-length
-    password: "{{ lookup('passwordstore', 'db/{{ ansible_hostname }}-mysql create=true length=20') }}"
+    password: "{{ mysql_root_password }}"
   no_log: true
   when: mysql_root_creation_result|failed
   tags: