Merge branch 'docker' into 'main'

Add a basic Dockerfile

See merge request soapbox-pub/ditto!263

.dockerignore

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+.env
+*.cpuprofile
+*.swp
+deno-test.xml
+
+/data

Dockerfile

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+FROM denoland/deno:1.43.3
+EXPOSE 4036
+WORKDIR /app
+RUN mkdir -p data && chown -R deno data
+USER deno
+COPY . .
+RUN deno cache src/server.ts
+CMD deno task start