Add Dockerfile

Dockerfile

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+FROM rust:1.34.2-slim-stretch AS builder
+RUN rustup install nightly-x86_64-unknown-linux-gnu
+
+COPY . /sources
+WORKDIR /sources
+RUN cargo +nightly build --release
+RUN chown nobody:nogroup /sources/target/release/bin
+
+
+FROM debian:stretch-slim
+COPY --from=builder /sources/target/release/bin /pastebin
+
+USER nobody
+EXPOSE 8000
+ENTRYPOINT ["/pastebin"]