Dockerfile: multistage docker image

Dockerfile

@@ -1,7 +1,20 @@
-FROM rust:alpine
-COPY . .
+# Build Stage
+FROM rust:alpine AS builder
+WORKDIR /usr/src/
 RUN apk add --no-cache libgcc musl-dev
-RUN cargo install --path .
-EXPOSE 8080
-EXPOSE 5000
-ENTRYPOINT ["/usr/local/cargo/bin/flotte-user-management"]
+RUN rustup target add x86_64-unknown-linux-musl
+
+RUN USER=root cargo new flotte-user-management
+WORKDIR /usr/src/flotte-user-management
+COPY Cargo.toml Cargo.lock ./
+
+COPY msg-rpc ./msg-rpc
+RUN cargo build --release
+COPY src ./src
+RUN cargo install --target x86_64-unknown-linux-musl --path .
+
+# Bundle Stage
+FROM scratch
+COPY --from=builder /usr/local/cargo/bin/flotte-user-management .
+
+ENTRYPOINT ["./flotte-user-management"]