[feature] Add support for non-default Nginx external ports

docker-compose.yml

@@ -131,8 +131,8 @@ services:
          - dashboard.internal
          - api.internal
     ports:
-      - "80:80"
-      - "443:443"
+      - "${NGINX_80_PORT:-80}:80"
+      - "${NGINX_SSL_PORT:-443}:443"
     depends_on:
       - dashboard
       - api

docs/user/settings.rst

@@ -869,6 +869,26 @@ Nginx
 - **Example:** ``index index.html index.htm;``.
 - **Default:** ``""`` (empty string).
 
+``NGINX_SSL_PORT``
+~~~~~~~~~~~~~~~~~~~~
+
+- **Explanation:** Nginx container external port. Useful to set if, for
+  example, OpenWISP is going to run behind a reverse proxy listening on
+  the default port on the same host. This variable is only applicable when
+  ``SSL_CERT_MODE`` is ``Yes`` or ``SelfSigned``.
+- **Valid Values:** ``INTEGER``.
+- **Default:** ``443``.
+
+``NGINX_80_PORT``
+~~~~~~~~~~~~~~~~~~~~
+
+- **Explanation:** Nginx container external port. Useful to set if, for
+  example, OpenWISP is going to run behind a reverse proxy listening on
+  the default port on the same host. This variable is only applicable when
+  ``SSL_CERT_MODE`` is ``False``.
+- **Valid Values:** ``INTEGER``.
+- **Default:** ``80``.
+
 ``NGINX_GZIP_SWITCH``
 ~~~~~~~~~~~~~~~~~~~~~