Add a role to install 'ntfy' push-notification server.

This commit adds a 'matrix-ntfy' role that runs Ntfy server in Docker with
simple configuration, and plumbing to add the role to the playbook.

TODO: documentation, self-check, database persistence.

group_vars/matrix_servers

@@ -1552,6 +1552,7 @@ matrix_nginx_proxy_proxy_bot_go_neb_enabled: "{{ matrix_bot_go_neb_enabled }}"
 matrix_nginx_proxy_proxy_jitsi_enabled: "{{ matrix_jitsi_enabled }}"
 matrix_nginx_proxy_proxy_grafana_enabled: "{{ matrix_grafana_enabled }}"
 matrix_nginx_proxy_proxy_sygnal_enabled: "{{ matrix_sygnal_enabled }}"
+matrix_nginx_proxy_proxy_ntfy_enabled: "{{ matrix_ntfy_enabled }}"
 
 matrix_nginx_proxy_proxy_matrix_corporal_api_enabled: "{{ matrix_corporal_enabled and matrix_corporal_http_api_enabled }}"
 matrix_nginx_proxy_proxy_matrix_corporal_api_addr_with_container: "matrix-corporal:41081"
@@ -1634,6 +1635,8 @@ matrix_nginx_proxy_systemd_wanted_services_list: |
     +
     (['matrix-sygnal.service'] if matrix_sygnal_enabled else [])
     +
+    (['matrix-ntfy.service'] if matrix_ntfy_enabled else [])
+    +
     (['matrix-jitsi.service'] if matrix_jitsi_enabled else [])
     +
     (['matrix-bot-go-neb.service'] if matrix_bot_go_neb_enabled else [])
@@ -1667,6 +1670,8 @@ matrix_ssl_domains_to_obtain_certificates_for: |
     +
     ([matrix_server_fqn_sygnal] if matrix_sygnal_enabled else [])
     +
+    ([matrix_server_fqn_ntfy] if matrix_ntfy_enabled else [])
+    +
     ([matrix_domain] if matrix_nginx_proxy_base_domain_serving_enabled else [])
     +
     matrix_ssl_additional_domains_to_obtain_certificates_for
@@ -1960,6 +1965,20 @@ matrix_sygnal_container_http_host_bind_port: "{{ '' if matrix_nginx_proxy_enable
 #
 ######################################################################
 
+######################################################################
+#
+# matrix-ntfy
+#
+######################################################################
+
+matrix_ntfy_enabled: false
+
+######################################################################
+#
+# /matrix-ntfy
+#
+######################################################################
+
 ######################################################################
 #
 # matrix-redis