create hello.rs program with some rust code example

Cargo.toml

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+[package]
+name = "hello_world" # the name of the package
+version = "0.1.0"    # the current version, obeying semver
+authors = ["Alice <a@example.com>", "Bob <b@example.com>"]
+edition = '2018'
+#build = "hello.rs"
+publish = false
+
+[dependencies]
+rand = "0.7.3"
+

Dockerfile

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+FROM rust:1.40-alpine as builder
+
+VOLUME /usr/local/cargo/bin/
+WORKDIR /usr/src/myapp
+COPY . .
+RUN cargo install --root /usr/local --path .
+
+#FROM debian:buster-slim
+#
+#RUN apt-get update && apt-get install -y extra-runtime-dependencies
+#COPY --from=builder /usr/local/cargo/bin/myapp /usr/local/bin/myapp
+#CMD ["hello"]
+
+#CMD ["/usr/local/cargo/bin/hello"]
+CMD sh -c "while true; do sleep 10; done"

Makefile

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+
+
+build: src/bin/*.rs Dockerfile
+	docker build -t my-rust-app .
+
+run: build
+	docker rm -f rust-hello || true
+	docker run -d -it --rm --name rust-hello my-rust-app
+
+exec: 
+	docker exec -it rust-hello sh

src/bin/hello.rs

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+
+
+fn fair_dice_roll() -> i32 {
+    let x = vec![1, 2, 3, 4, 5, 6, 7, 8]
+        .iter()
+        .map(|x| x + 3)
+        .fold(0, |x, y| x + y);
+   return x;
+}
+
+
+fn main() {
+
+    let res = fair_dice_roll();
+    println!("{}", res);
+}
+