Add source option to docker_image to fix deprecation warning

roles/matrix-nginx-proxy/tasks/setup_nginx_proxy.yml

@@ -97,6 +97,7 @@
 - name: Ensure nginx Docker image is pulled
   docker_image:
     name: "{{ matrix_nginx_proxy_docker_image }}"
+    source: "pull"
   when: matrix_nginx_proxy_enabled|bool
 
 - name: Ensure matrix-nginx-proxy.service installed

roles/matrix-nginx-proxy/tasks/ssl/setup_ssl_lets_encrypt.yml

@@ -36,6 +36,7 @@
 - name: Ensure certbot Docker image is pulled
   docker_image:
     name: "{{ matrix_ssl_lets_encrypt_certbot_docker_image }}"
+    source: "pull"
   when: "matrix_ssl_retrieval_method == 'lets-encrypt'"
 
 - name: Obtain Let's Encrypt certificates