Use /run temp paths for nginx

maubot-src/nginx.conf

@@ -8,6 +8,11 @@ events {
 http {
     include /etc/nginx/mime.types;
     default_type application/octet-stream;
+    client_body_temp_path /run/nginx/client_body;
+    proxy_temp_path /run/nginx/proxy_temp;
+    fastcgi_temp_path /run/nginx/fastcgi_temp;
+    uwsgi_temp_path /run/nginx/uwsgi_temp;
+    scgi_temp_path /run/nginx/scgi_temp;
     sendfile on;
     tcp_nopush on;
     tcp_nodelay on;

maubot-src/start.sh

@@ -11,7 +11,11 @@ MAUBOT_INTERNAL_PORT="${MAUBOT_INTERNAL_PORT:-3001}"
 
 umask 0027
 
-mkdir -p /run/nginx \
+mkdir -p /run/nginx/client_body \
+    /run/nginx/proxy_temp \
+    /run/nginx/fastcgi_temp \
+    /run/nginx/uwsgi_temp \
+    /run/nginx/scgi_temp \
     "${DATA_DIR}" \
     "${DATA_DIR}/plugins" \
     "${DATA_DIR}/trash" \