Prepare dockerized build for Railway

Dockerfile

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+# Build Stage
+FROM rust:1.68.0 as builder
+
+RUN USER=root cargo new --bin time-banner
+WORKDIR ./time-banner
+ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
+COPY ./Cargo.toml ./Cargo.toml
+# Build empty app with downloaded dependencies to produce a stable image layer for next build
+RUN cargo build --release
+
+# Build web app with own code
+RUN rm src/*.rs
+ADD . ./
+RUN rm ./target/release/deps/time-banner*
+RUN cargo build --release
+
+
+FROM debian:buster-slim
+ARG APP=/usr/src/app
+
+RUN apt-get update \
+    && apt-get install -y ca-certificates tzdata \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV TZ=Etc/UTC \
+    APP_USER=appuser
+
+RUN groupadd $APP_USER \
+    && useradd -g $APP_USER $APP_USER \
+    && mkdir -p ${APP}
+
+COPY --from=builder /time-banner/target/release/time-banner ${APP}/time-banner
+
+RUN chown -R $APP_USER:$APP_USER ${APP}
+
+USER $APP_USER
+WORKDIR ${APP}
+
+EXPOSE 3000
+ENV PORT 3000
+
+
+CMD ["./time-banner"]