Add Dockerfile

Dockerfile

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+FROM rust:1.59.0-slim-bullseye as build
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y libssl-dev pkg-config
+
+COPY ./src ./src
+COPY ./Cargo.toml ./
+COPY ./Cargo.lock ./
+
+RUN cargo build --release
+
+#################
+# RELEASE IMAGE #
+#################
+FROM debian:bullseye-slim
+
+WORKDIR /app
+COPY --from=build /app/target/release/le-easy-certs /app/
+
+ENV LE_CONF=/le-conf/le-conf.toml
+
+CMD ["./le-easy-certs"]