Docker build for slideshow app.

Dockerfile

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+FROM rust:latest AS build-env
+COPY ./ /src/
+COPY ./dockerfiles/netrc /root/.netrc
+RUN mkdir /root/.cargo
+COPY ./dockerfiles/cargo-config /.cargo/config
+RUN apt-get update && apt-get install -y strace build-essential clang
+WORKDIR /src
+RUN cargo version && cargo install --path .
+
+FROM rust:slim
+COPY --from=build-env /usr/local/cargo/bin/photosync /usr/bin/