Add docker config

Dockerfile

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+FROM ruby:2.6.3-alpine
+
+RUN apk update && \
+      apk add --no-cache build-base git postgresql-dev imagemagick
+RUN apk add --no-cache imagemagick-dev=6.9.6.8-r1 --repository http://dl-3.alpinelinux.org/alpine/v3.5/main/
+
+RUN mkdir /app
+WORKDIR /app
+
+COPY Gemfile Gemfile.lock /app/
+RUN bundle install
+
+COPY . /app
+
+CMD ["bundle", "exec", "ruby", "bot.rb"]

docker-compose.yml

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+version: "3.7"
+
+services:
+  bot:
+    build: .
+    depends_on:
+      - db
+    environment:
+      - POSTGRES_DB
+      - POSTGRES_HOST=db
+      - POSTGRES_PASSWORD
+      - POSTGRES_PORT=6543
+      - POSTGRES_USER
+      - DISCORD_CLIENT_ID
+      - DISCORD_SECRET
+      - DISCORD_BOT_TOKEN
+
+  db:
+    image: postgres:11.2-alpine
+    environment:
+      - POSTGRES_DB
+      - POSTGRES_PASSWORD
+      - POSTGRES_USER
+    ports:
+      - ${DB_HOST_PORT}:6543
+    volumes:
+      - postgres-persisted-volume:/var/lib/postgresql/data
+
+volumes:
+  postgres-persisted-volume: