feat: support nginx custom parameters

README.md

@@ -30,7 +30,7 @@ You can override the nginx root via setting the `NGINX_ROOT` environment variabl
 # where the app is named `static-app`
 # and the root dir is _site
 dokku config:set static-app NGINX_ROOT=_site
-````
+```
 
 ### Default to index for history routing
 
@@ -42,6 +42,23 @@ By default, this buildpack will 404 if a requested file is not found. For static
 dokku config:set static-app NGINX_DEFAULT_REQUEST=index.html
 ```
 
+### Custom nginx directives
+
+You can configure following nginx directives via environment variables.
+
+- `NGINX_WORKERS` : `worker_processes` directive
+- `NGINX_WORKER_CONNECTIONS` : `worker_connections` directive
+- `NGINX_CLIENT_BODY_TIMEOUT` : `client_body_timeout` directive
+- `NGINX_CLIENT_MAX_BODY_SIZE` : `client_max_body_size` directive (in MB)
+
+```shell
+# where the app is named `static-app`
+dokku config:set static-app NGINX_WORKERS=4 \
+                            NGINX_WORKER_CONNECTIONS=1024 \
+                            NGINX_CLIENT_BODY_TIMEOUT=5 \
+                            NGINX_CLIENT_MAX_BODY_SIZE=1
+```
+
 ### Custom nginx config file
 
 You may completely override the built-in nginx config by placing an `app-nginx.conf.sigil` file in the root, modeled after our own [`conf/app-nginx.conf.sigil`](https://github.com/dokku/buildpack-nginx/blob/master/conf/app-nginx.conf.sigil). This will be used inside of the container, and not by the host Dokku instance. See the [sigil project](https://github.com/gliderlabs/sigil) for more information concerning the sigil format.