chore: support docker build

Dockerfile

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+FROM denoland/deno:1.45.5
+
+# The port that your application listens to.
+EXPOSE 1993
+
+WORKDIR /app
+
+# These steps will be re-run upon each file change in your working directory:
+COPY . .
+# Compile the main app so that it doesn't need to be compiled each startup/entry.
+RUN deno cache main.ts
+
+CMD ["run", "--allow-net", "--allow-env", "--unstable", "main.ts"]