Enable OCSP stapling for the federation port

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1057

Not sure if this is beneficial though.

roles/matrix-nginx-proxy/defaults/main.yml

@@ -223,6 +223,7 @@ matrix_nginx_proxy_proxy_matrix_federation_api_addr_sans_container: "localhost:1
 matrix_nginx_proxy_proxy_matrix_federation_api_client_max_body_size_mb: "{{ (matrix_nginx_proxy_proxy_matrix_client_api_client_max_body_size_mb | int) * 3 }}"
 matrix_nginx_proxy_proxy_matrix_federation_api_ssl_certificate: "{{ matrix_ssl_config_dir_path }}/live/{{ matrix_nginx_proxy_proxy_matrix_hostname }}/fullchain.pem"
 matrix_nginx_proxy_proxy_matrix_federation_api_ssl_certificate_key: "{{ matrix_ssl_config_dir_path }}/live/{{ matrix_nginx_proxy_proxy_matrix_hostname }}/privkey.pem"
+matrix_nginx_proxy_proxy_matrix_federation_api_ssl_trusted_certificate: "{{ matrix_ssl_config_dir_path }}/live/{{ matrix_nginx_proxy_proxy_matrix_hostname }}/chain.pem"
 
 # The tmpfs at /tmp needs to be large enough to handle multiple concurrent file uploads.
 matrix_nginx_proxy_tmp_directory_size_mb: "{{ (matrix_nginx_proxy_proxy_matrix_federation_api_client_max_body_size_mb | int) * 50 }}"

roles/matrix-nginx-proxy/templates/nginx/conf.d/matrix-domain.conf.j2

@@ -242,6 +242,12 @@ server {
 			ssl_ciphers {{ matrix_nginx_proxy_ssl_ciphers }};
 		{% endif %}
 		ssl_prefer_server_ciphers {{ matrix_nginx_proxy_ssl_prefer_server_ciphers }};
+
+		{% if matrix_nginx_proxy_ocsp_stapling_enabled %}
+			ssl_stapling on;
+			ssl_stapling_verify on;
+			ssl_trusted_certificate {{ matrix_nginx_proxy_proxy_matrix_federation_api_ssl_trusted_certificate }};
+		{% endif %}
 	{% endif %}
 
 	location / {