Nginx with TLS (Handel certs in Docker)

I use alot of nginx with tls. And almost ll of my docker are public. So how do i solve the tls issues.
Well i have done it like so in my docker file i generate ssl cert for nginx in a folder i called /etc/nginx/tls
Then when i use my ngix in dev i get the generated certs.

But in prod then i mount the volum from the host with the correct certs into my ngix in /etc/nginx/tls and now my nginx pick up the prod certs and use them.

FROM nginx
MAINTAINER Fareoffice

LABEL name="Hackathon"
LABEL vendor="Base"

#Setting up tls
RUN mkdir /etc/nginx/tls
WORKDIR /etc/nginx/tls
RUN openssl req \
 -new \
 -newkey rsa:4096 \
 -days 365 \
 -nodes \
 -x509 \
 -subj "/C=US/ST=Denial/L=Springfield/O=Dis/CN=www.example.com" \
 -keyout nginx.key \
 -out nginx.crt

#Adding config
ADD nginx.conf /etc/nginx/nginx.conf


CMD nginx -g "daemon off;"

my nginx config

#user nobody;
worker_processes 1;

events {
 worker_connections 1024;
}


http {
 include mime.types;
 include sites-enabled/*.conf;

default_type application/octet-stream;
 sendfile on;
 keepalive_timeout 65;


upstream web {
 server web1:5000;
 server web2:5000;
 server web3:5000;
 server web4:5000;

}

server { 
 server_name example.com;

listen 80;
 listen 443 ssl;

ssl_certificate /etc/nginx/tls/nginx.crt;
 ssl_certificate_key /etc/nginx/tls/nginx.key;
 ssl_trusted_certificate /etc/nginx/tls/ca-certs.pem;

location / {
 
 proxy_pass http://web;
 proxy_set_header Host \$http_host; # required for docker client's sake
 proxy_set_header X-Real-IP \$remote_addr; # pass on real client's IP
 proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
 proxy_set_header X-Forwarded-Proto \$scheme;
 proxy_read_timeout 900;
 }

}

}

Then when I start my continer in prod i uses docker run -d -v /etc/tls/hosname:/etc/ngix/tls -t cars-lb