docker image (#9)

* docker image

* nl

.dockerignore

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+target/
+tests/
+tracing/
+.circleci/

Dockerfile

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+FROM rust:1.58-slim-buster AS builder
+COPY . /app
+WORKDIR /app
+RUN cargo build --release
+
+FROM debian:buster-slim
+COPY --from=builder /app/target/release/pgcat /usr/bin/pgcat
+COPY --from=builder /app/pgcat.toml /etc/pgcat/pgcat.toml
+WORKDIR /etc/pgcat
+ENTRYPOINT ["/usr/bin/pgcat"]