Exposed port 8080 for nginx not configurable

[gs4711]

Unfortunatelly the port 8080 is as far as I see manually defined within several configration files:

• ./mod/nginx/bigbluebutton: listen 8080 default_server;
• ./mod/nginx/bigbluebutton: listen [::]:8080 default_server;
• ./mod/https/site-ipv4only.conf: proxy_pass http://127.0.0.1:8080;
• ./mod/https/site.conf: proxy_pass http://$endpoint_addr:8080;
• ./mod/etherpad/etherpad-export.sh:curl -v -X POST "http://jodconverter:8080/lool/convert-to/$convertTo" \
• ./mod/bbb-web/office-convert.sh:curl -v -X POST "http://jodconverter:8080/lool/convert-to/$convertTo" \
• ./docs/existing-web-server.md:2. Now all the required Docker containers should be running. BigBlueButton listens to port 8080. Create a virtual host by which BigBlueButton will be publicly accessible (in this case, let's assume the following server name for the virtual host: bbb.example.com). Enable SSL for the new https virtual host. Make sure that the SSL certificate you will be using is signed by a CA (Certificate Authority). You could generate an SSL certificate for free using Let's Encrypt. It is suggested to add some directives to the http virtual host bbb.example.com to redirect all requests to the https one.
• ./docs/existing-web-server.md:RewriteRule .* ws://127.0.0.1:8080%{REQUEST_URI} [P,QSA,L]
• ./docs/existing-web-server.md: ProxyPass http://127.0.0.1:8080/
• ./docs/existing-web-server.md: ProxyPassReverse http://127.0.0.1:8080/
• ./docker-compose.tmpl.yml: BIGBLUEBUTTON_ENDPOINT: http://10.7.7.1:8080/bigbluebutton/api/
• ./docker-compose.tmpl.yml: API_BASE_URL: http://10.7.7.1:8080/bigbluebutton/api/

This should be configurable as it will collide e.g. with a gitlab installation.