Add files necessary for production deployment

* Dockerfile, docker-compose template
* nginx config
* uwsgi config
* wait-for-postgres script
* requirements.txt
* Some other stuff

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

docker-compose.example.yaml

@@ -0,0 +1,35 @@
+version: "3.8"
+services:
+  app:
+    build: .
+    volumes:
+      - "static:/app/static"
+      - "media:/app/media"
+      - ".:/app"
+    depends_on:
+      - db
+    env_file:
+      - env/app.env
+      - env/db.env
+    restart: always
+  nginx:
+    image: "nginx:latest"
+    depends_on:
+      - app
+    ports:
+      - "8000:80"
+    volumes:
+      - "static:/usr/share/nginx/html/static"
+      - "media:/usr/share/nginx/html/media"
+      - "./nginx.conf:/etc/nginx/conf.d/default.conf"
+    restart: always
+  db:
+    image: "postgres:14-alpine"
+    env_file:
+      - env/db.env
+    volumes:
+      - "./db/postgres:/var/lib/postgresql/data"
+    restart: always
+volumes:
+  static:
+  media: