Fix opendkim socket permissions

roles/opendkim/handlers/main.yml

@@ -4,3 +4,8 @@
   ansible.builtin.service:
     name: opendkim
     state: restarted
+
+- name: restart postfix
+  ansible.builtin.service:
+    name: postfix
+    state: restarted

roles/opendkim/tasks/install.yml

@@ -5,3 +5,10 @@
     name:
       - opendkim
       - opendkim-tools
+
+- name: add postfix to opendkim group
+  ansible.builtin.user:
+    name: postfix
+    groups: opendkim
+    append: yes
+  notify: restart postfix