Initial work on matrix-homeserver-proxy role and eliminating matrix-nginx-proxy

This is still very far from usable.

Various bridges and bots are still talking to
`matrix-nginx-proxy` instead of the new `matrix-homeserver-proxy` role.
These services need to be reworked. While reworking them,
various cleanups are being done as well as adding Traefik-labels to
those that need them.

roles/custom/matrix-homeserver-proxy/templates/nginx/conf.d/matrix-homeserver-proxy.conf.j2

@@ -0,0 +1,62 @@
+#jinja2: lstrip_blocks: "True"
+
+server {
+	listen 8008;
+	server_name {{ matrix_homeserver_proxy_hostname }};
+
+	server_tokens off;
+	root /dev/null;
+
+	gzip on;
+	gzip_types text/plain application/json;
+
+	{% for configuration_block in matrix_homeserver_proxy_client_api_additional_server_configuration_blocks %}
+		{{- configuration_block }}
+	{% endfor %}
+
+	{# Everything else just goes to the API server ##}
+	location / {
+		{# Use the embedded DNS resolver in Docker containers to discover the service #}
+		resolver {{ matrix_homeserver_proxy_http_level_resolver }} valid=5s;
+		set $backend "{{ matrix_homeserver_proxy_client_api_addr }}";
+		proxy_pass http://$backend;
+
+		proxy_set_header Host $host;
+
+		client_body_buffer_size 25M;
+		client_max_body_size {{ matrix_homeserver_proxy_client_api_client_max_body_size_mb }}M;
+		proxy_max_temp_file_size 0;
+	}
+}
+
+{% if matrix_homeserver_proxy_federation_api_enabled %}
+server {
+	listen 8048;
+	server_name {{ matrix_homeserver_proxy_hostname }};
+
+	server_tokens off;
+
+	root /dev/null;
+
+	gzip on;
+	gzip_types text/plain application/json;
+
+	{% for configuration_block in matrix_homeserver_proxy_federation_api_additional_server_configuration_blocks %}
+		{{- configuration_block }}
+	{% endfor %}
+
+	{# Everything else just goes to the API server ##}
+	location / {
+		{# Use the embedded DNS resolver in Docker containers to discover the service #}
+		resolver {{ matrix_homeserver_proxy_http_level_resolver }} valid=5s;
+		set $backend "{{ matrix_homeserver_proxy_federation_api_addr }}";
+		proxy_pass http://$backend;
+
+		proxy_set_header Host $host;
+
+		client_body_buffer_size 25M;
+		client_max_body_size {{ matrix_homeserver_proxy_federation_api_client_max_body_size_mb }}M;
+		proxy_max_temp_file_size 0;
+	}
+}
+{% endif %}

roles/custom/matrix-homeserver-proxy/templates/nginx/conf.d/nginx-http.conf.j2

@@ -0,0 +1,13 @@
+#jinja2: lstrip_blocks: "True"
+# The default is aligned to the CPU's cache size,
+# which can sometimes be too low.
+# Thus, we ensure a larger bucket size value is used.
+server_names_hash_bucket_size 64;
+
+{% if matrix_homeserver_proxy_http_level_resolver %}
+resolver {{ matrix_homeserver_proxy_http_level_resolver }};
+{% endif %}
+
+{% for configuration_block in matrix_homeserver_proxy_http_additional_server_configuration_blocks %}
+	{{- configuration_block }}
+{% endfor %}