add configuration to use traefik-golang sample with Docker Dev Environments feature (#254)

* add configuration to use traefik-golang sample with Docker Dev Environments feature
* use apt-get instead of apt and --no-install-recommends option

Co-authored-by: Milas Bowman <milasb@gmail.com>
Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>

traefik-golang/.docker/docker-compose.yaml

@@ -0,0 +1,22 @@
+services:
+  frontend:
+    image: traefik:2.6
+    command: --providers.docker --entrypoints.web.address=:80 --providers.docker.exposedbydefault=false
+    ports:
+      # The HTTP port
+      - "80:80"
+    volumes:
+      # So that Traefik can listen to the Docker events
+      - /var/run/docker.sock:/var/run/docker.sock
+    depends_on:
+      - backend
+  backend:
+    build:
+      context: backend
+      target: dev-envs
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.go.rule=Path(`/`)"
+      - "traefik.http.services.go.loadbalancer.server.port=80"

traefik-golang/README.md

@@ -92,3 +92,11 @@ Stop and remove the containers
 ```
 $ docker compose down
 ```
+
+## Use with Docker Development Environments
+
+You can use this sample with the Dev Environments feature of Docker Desktop.  
+To develop directly the backend service inside containers, you just need to use the https git url of the sample:  
+`https://github.com/docker/awesome-compose/tree/master/traefik-golang`
+
+![page](../dev-envs.png)

traefik-golang/backend/Dockerfile

@@ -1,9 +1,27 @@
-FROM golang:1.13 AS build
+# syntax=docker/dockerfile:1.4
+
+FROM --platform=$BUILDPLATFORM golang:1.18 AS build
 
 WORKDIR /compose/hello-docker
 COPY main.go main.go
 RUN CGO_ENABLED=0 go build -o backend main.go
 
+FROM build as dev-envs
+
+RUN <<EOF
+apt-get update
+apt-get install -y --no-install-recommends git
+EOF
+
+RUN <<EOF
+useradd -s /bin/bash -m vscode
+groupadd docker
+usermod -aG docker vscode
+EOF
+# install Docker tools (cli, buildx, compose)
+COPY --from=gloursdocker/docker / /
+CMD ["go", "run", "main.go"]
+
 FROM scratch
 COPY --from=build /compose/hello-docker/backend /usr/local/bin/backend
 CMD ["/usr/local/bin/backend"]