chore: add proxy_max_temp_file_size

Signed-off-by: Vitor Mattos <vitor@php.rio>

Author: vitormattos

volumes/conf.d/proxy_max_temp_file_size.conf

@@ -0,0 +1,4 @@
+# Reference:
+#    https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_max_temp_file_size
+#    https://github.com/nginx-proxy/nginx-proxy/issues/241#issuecomment-357422465
+proxy_max_temp_file_size 0