_output

docker-compose build
Building hello_world
Step 1/4 : FROM crystallang/crystal:latest
 ---> 94db55f89e70
Step 2/4 : WORKDIR /app
 ---> Using cache
 ---> c4cef2a24fe6
Step 3/4 : ADD . /app/
 ---> a986be8e1c72
Step 4/4 : CMD crystal build src/hello.cr -o bin/hello --release
 ---> Running in 3d8d9bdeed92
Removing intermediate container 3d8d9bdeed92
 ---> d5afb3f92272
Successfully built d5afb3f92272
Successfully tagged hello:latest
docker-compose up
Removing hello_hello_world_1
Recreating 9281838a6d12_hello_hello_world_1 ... done
Attaching to hello_hello_world_1
hello_world_1  | standard_init_linux.go:207: exec user process caused "exec format error"
hello_hello_world_1 exited with code 1

docker-compose.yml

version: '3'
services:
  hello_world:
    build: .
    image: hello
    command: /app/bin/hello

Dockerfile

FROM crystallang/crystal:latest

WORKDIR /app

ADD . /app/

CMD crystal build src/hello.cr -o bin/hello --release