Make matrix-mailer exit more gracefully

roles/matrix-mailer/defaults/main.yml

@@ -2,7 +2,7 @@ matrix_mailer_enabled: true
 
 matrix_mailer_base_path: "{{ matrix_base_data_path }}/mailer"
 
-matrix_mailer_docker_image: "devture/exim-relay:4.92.1-r0-1"
+matrix_mailer_docker_image: "devture/exim-relay:4.92.1-r0-2"
 matrix_mailer_docker_image_force_pull: "{{ matrix_mailer_docker_image.endswith(':latest') }}"
 
 # The user/group that the container runs with.

roles/matrix-mailer/templates/systemd/matrix-mailer.service.j2

@@ -14,6 +14,7 @@ ExecStart=/usr/bin/docker run --rm --name matrix-mailer \
 			--user={{ matrix_mailer_container_user_uid }}:{{ matrix_mailer_container_user_gid }} \
 			--cap-drop=ALL \
 			--read-only \
+			--init \
 			--tmpfs=/var/spool/exim:rw,noexec,nosuid,size=100m \
 			--network={{ matrix_docker_network }} \
 			--env-file={{ matrix_mailer_base_path }}/env-mailer \