Update docker configuration:

- .dockerignore for building
- Dockerfile created usign node-10-alpine and nginx-mainline
- docker/ scripts and templates added

docker/docker-entrypoint.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+envsubst "$(env | sed -e 's/=.*//' -e 's/^/\$/g')" < "/etc/nginx/nginx.conf.tpl" > "/etc/nginx/nginx.conf"
+exec "$@"

docker/nginx.conf.tpl

@@ -0,0 +1,32 @@
+user  nginx;
+worker_processes  1;
+error_log  /var/log/nginx/error.log warn;
+pid        /tmp/nginx.pid;
+events {
+    worker_connections  1024;
+}
+http {
+    client_body_temp_path /tmp/client_temp;
+    proxy_temp_path       /tmp/proxy_temp_path;
+    fastcgi_temp_path     /tmp/fastcgi_temp;
+    uwsgi_temp_path       /tmp/uwsgi_temp;
+    scgi_temp_path        /tmp/scgi_temp;
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+    access_log  /var/log/nginx/access.log  main;
+    sendfile        on;
+    keepalive_timeout  65;
+    proxy_cache_path /tmp/pleroma-media-cache levels=1:2 keys_zone=pleroma_media_cache:10m max_size=10g
+                     inactive=720m use_temp_path=off;
+    server {
+        listen 80;
+        server_name _;
+        root /usr/share/nginx/html;
+        location / {
+        try_files $uri $uri/ /index.html;
+      }
+    }
+}