Add dockerfile

GhostBallBot/Dockerfile

@@ -0,0 +1,20 @@
+# Copyright 2022 - c0de <c0de@c0de.dev>
+# Licensed under the MIT License (https://opensource.org/licenses/MIT)
+
+# Multistage docker file, using a very minimal 17.6 MB base image
+# Results in a cross-platform 76 MB image including all dependencies
+# Build with: docker build -t ghotballbot:<version> .
+# Run with: docker run -it
+
+FROM python:3.10-alpine3.16 AS build
+
+RUN pip install discord peewee
+COPY . /app
+
+FROM build AS run
+
+ENV discord_token ""
+ENV database_path "/tmp/ghostball.db"
+
+WORKDIR /app
+CMD ["python", "/app/main.py"]