Use jinja2 for building nginx config

nginx/Dockerfile

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+FROM alpine:edge
+
+RUN echo "@testing http://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
+ && apk add --no-cache nginx nginx-mod-mail py-setuptools jinja2-cli@testing
+
+COPY conf /conf
+COPY start.sh /start.sh
+
+CMD /start.sh

nginx/nginx.conf

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+#  Basic configuration
+user nginx;
+worker_processes  1;
+error_log /dev/stderr info;
+pid /var/run/nginx.pid;
+load_module "modules/ngx_mail_module.so";
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    # Standard HTTP configuration with slight hardening
+    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;
+
+      # Actual logic
+      location / {
+        return 301 $scheme://$host/webmail/;
+      }
+
+      location /webmail {
+        proxy_pass http://webmail;
+      }
+
+      location /admin {
+        proxy_pass http://admin;
+      }
+
+      location /webdav {
+        proxy_pass http://webdav:5232;
+      }
+    }
+}
+
+mail {
+    server_name test.mailu.io;
+    auth_http http://172.18.0.1:5000/nginx;
+    proxy_pass_error_message on;
+
+    server {
+      listen 25;
+      protocol smtp;
+      smtp_auth plain;
+    }
+
+    server {
+      listen 143;
+      protocol imap;
+      imap_auth plain;
+    }
+
+    
+}

nginx/start.sh

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+#!/bin/sh
+
+jinja2 /conf/nginx.conf > /etc/nginx/nginx.conf
+
+exec nginx -g 'daemon off;'