Move to Docker Compose and multiple containers

nginx/Dockerfile

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+FROM nginx
+
+COPY nginx.conf /etc/nginx/nginx.conf

nginx/nginx.conf

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+user www-data;
+worker_processes  1;
+
+error_log /dev/stderr info;
+pid /var/run/nginx.pid;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+    access_log /dev/stdout;
+    sendfile on;
+    keepalive_timeout  65;
+    server_tokens off;
+
+    server {
+      listen 80;
+      listen 443 ssl;
+
+      ssl_protocols TLSv1.1 TLSv1.2;
+      ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';
+      ssl_prefer_server_ciphers on;
+      ssl_session_timeout 5m;
+      ssl_session_cache shared:SSL:50m;
+      ssl_certificate /certs/cert.pem;
+      ssl_certificate_key /certs/key.pem;
+
+      if ($scheme = http) {
+    		return 301 https://$host$request_uri;
+    	}
+
+      location / {
+        proxy_pass http://webmail;
+      }
+
+      location /admin {
+        proxy_pass http://admin;
+      }
+    }
+}