Restructure folders (#411)

basics/docker_sample/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "docker_sample"
+version = "0.1.0"
+authors = ["docker_sample <docker_sample@sample.com>"]
+edition = "2018"
+
+[dependencies]
+actix-web = "3"

basics/docker_sample/Dockerfile

@@ -0,0 +1,24 @@
+FROM rust:1-slim-buster AS base
+
+ENV USER=root
+
+WORKDIR /code
+RUN cargo init
+COPY Cargo.toml /code/Cargo.toml
+RUN cargo fetch
+
+COPY src /code/src
+
+CMD [ "cargo", "test", "--offline" ]
+
+FROM base AS builder
+
+RUN cargo build --release --offline
+
+FROM rust:1-slim-buster
+
+COPY --from=builder /code/target/release/docker_sample /usr/bin/docker_sample
+
+EXPOSE 5000
+
+ENTRYPOINT [ "/usr/bin/docker_sample" ]

basics/docker_sample/README.MD

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+# Docker sample
+
+## Build image
+
+```shell
+docker build -t docker_sample .
+```
+
+## Run built image
+
+```shell
+docker run -d -p 5000:5000 docker_sample
+# and the server should start instantly
+curl http://localhost:5000
+```
+
+## Running unit tests
+
+```shell
+docker build -t docker_sample:test --target base .
+docker run --rm docker_sample:test
+```

basics/docker_sample/src/main.rs

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+#[macro_use]
+extern crate actix_web;
+
+use actix_web::{App, HttpResponse, HttpServer, Responder};
+
+#[get("/")]
+async fn index() -> impl Responder {
+    println!("GET: /");
+    HttpResponse::Ok().body("Hello world!")
+}
+
+#[get("/again")]
+async fn again() -> impl Responder {
+    println!("GET: /again");
+    HttpResponse::Ok().body("Hello world again!")
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    println!("Starting actix-web server");
+
+    HttpServer::new(|| App::new().service(index).service(again))
+        .bind("0.0.0.0:5000")?
+        .run()
+        .await
+}