commands.txt

# create a test app
flynn create --remote="" test-app

# create a release using the latest app image
flynn -a test-app release add -f config.json "https://registry.hub.docker.com?name=brandfolder/flynn-test-app&id=d0f2136468110ad368684c7ccb04e0a756830c18926e50a4ef0e87a8b46022a5"

# scale the server to one process, it should come up.
flynn -a test-app scale web=1

# curl the app, should get 'hello earth'
curl http://test-app.demo.localflynn.com/

config.json

{
    "processes": {
        "web": {
            "cmd": ["rackup", "-p$PORT", "-h$HOST"],
            "ports": [{
              "port": 8080,
              "proto": "tcp",
              "service": {
                "name": "web",
                "create": true,
                "check": { "type": "tcp" }
              }
            }]
        }
    }
}

see the app here:
https://github.com/brandfolder/flynn-test-app