chore(nginx-fpm-proxy): allow specifying multiple sockets as upstreams

roles/nginx-fpm-proxy/templates/nextcloud-nginx.conf.j2

@@ -1,6 +1,12 @@
 upstream php-handler {
 {% if fpm_socket %}
+{% if fpm_socket is sequence %}
+{% for upstream in fpm_socket %}
+    server unix:{{ upstream }};
+{% endfor %}
+{% else %}
     server unix:{{ fpm_socket }};
+{% endif %}
 {% else %}
     server {{ fpm_server }}:{{ fpm_server_port }};
 {% endif %}

roles/server/templates/nextcloud-fpm.ini.j2

@@ -4,7 +4,7 @@ user = www-data
 group = www-data
 
 {% if nextcloud_socket_path is defined and nextcloud_socket_path is string %}
-listen = {{ nextcloud_container_php_socket_path }}/nextcloud.sock
+listen = {{ nextcloud_container_php_socket_path }}/{{ nextcloud_container_name }}.sock
 listen.owner = www-data
 listen.group = www-data
 listen.mode = 0666