chore: Set up Deno project with Docker, environment configuration, and basic server

deno/Dockerfile

@@ -0,0 +1,15 @@
+FROM denoland/deno:2.0.1
+
+WORKDIR /app
+
+COPY deno.json .
+
+RUN deno install
+
+COPY . .
+RUN deno cache main.ts
+
+ARG PORT=8000
+EXPOSE $PORT
+
+CMD ["task", "start"]