Reload systemd services when they get updated

Fixes #69 (Github Issue)

roles/matrix-mailer/tasks/setup_mailer.yml

@@ -30,8 +30,14 @@
     src: "{{ role_path }}/templates/systemd/matrix-mailer.service.j2"
     dest: "/etc/systemd/system/matrix-mailer.service"
     mode: 0644
+  register: matrix_mailer_systemd_service_result
   when: matrix_mailer_enabled
 
+- name: Ensure systemd reloaded after matrix-mailer.service installation
+  service:
+    daemon_reload: yes
+  when: "matrix_mailer_enabled and matrix_mailer_systemd_service_result.changed"
+
 #
 # Tasks related to getting rid of the mailer (if it was previously enabled)
 #
@@ -55,6 +61,11 @@
     state: absent
   when: "not matrix_mailer_enabled and matrix_mailer_service_stat.stat.exists"
 
+- name: Ensure systemd reloaded after matrix-mailer.service removal
+  service:
+    daemon_reload: yes
+  when: "not matrix_mailer_enabled and matrix_mailer_service_stat.stat.exists"
+
 - name: Ensure Matrix mailer environment variables path doesn't exist
   file:
     path: "{{ matrix_mailer_base_path }}"