Aplicando Docker para montar el archivo

Dockerfile

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+FROM rust AS build
+WORKDIR /code
+COPY ./code .
+RUN cargo install --path .
+
+FROM debian:buster-slim
+COPY --from=build /usr/local/cargo/bin/clima /usr/local/bin/clima
+RUN apt-get update && apt-get install -y libssl-dev && rm -rf /var/lib/apt/lists/*
+ENV ACCUWHEATHER_API_ID "1"
+ENV PATH_TO_CITIES "/share/cities"
+CMD ["clima", $ACCUWHEATHER_API_ID, $PATH_TO_CITIES]

docker-compose.yml

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+version: '3'
+
+services:
+  app:
+    image: rust
+    build: .
+    env_file:
+      - .env
+    volumes:
+      - ./cities.json:/share/cities.json