feature: add Dockerfile

Dockerfile

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+FROM denoland/deno:latest
+
+EXPOSE 8000
+USER deno
+
+# Cache the dependencies as a layer (the following two steps are re-run only when deps.ts is modified).
+# Ideally cache deps.ts will download and compile _all_ external files used in main.ts.
+ADD models /app/models
+ADD public /app/public
+ADD utils /app/utils
+COPY deno.json /app
+COPY deno.lock /app
+COPY README.md /app
+
+RUN deno install
+
+ENV FSDB_ROOT=/.fsdb
+ENV TRACE_ERROR_RESPONSES=true
+ENV SERVERUS_TYPESCRIPT_IMPORT_LOGGING=true
+ENV APP_ROOT=/app/public
+
+CMD ["sh", "-c", "deno --allow-env --allow-read --allow-write --allow-net jsr:@andyburke/serverus --root ${APP_ROOT}"]