Use alpine image for coturn

roles/matrix-coturn/defaults/main.yml

@@ -4,7 +4,7 @@ matrix_coturn_container_image_self_build: false
 matrix_coturn_container_image_self_build_repo: "https://github.com/coturn/coturn/tree/master/docker/coturn/alpine.git"
 
 matrix_coturn_version: 4.5.2
-matrix_coturn_docker_image: "{{ matrix_coturn_docker_image_name_prefix }}coturn/coturn:{{ matrix_coturn_version }}"
+matrix_coturn_docker_image: "{{ matrix_coturn_docker_image_name_prefix }}coturn/coturn:{{ matrix_coturn_version }}-alpine"
 matrix_coturn_docker_image_name_prefix: "{{ 'localhost/' if matrix_coturn_container_image_self_build else matrix_container_global_registry_prefix }}"
 matrix_coturn_docker_image_force_pull: "{{ matrix_coturn_docker_image.endswith(':latest') }}"