Procfile missing for Dockerfile or Pack image

[taraszka]

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Description of problem

The dokku-scheduler-kubernetes fail to deploy an app build by dokku using pack or dockerfile buildpacks when Procfile is missing.

How reproducible

1. install dokku
2. add dokku-scheduler-kubernetes
3. add an app and set the scheduler to kubernetes for an app
4. install pack from cloudnative buildpacks
5. set DOKKU_CNB_EXPERIMENTAL=1 for your app
6. deploy an app without Procfile to dokku; it will fail, saying that No profile is available for your app.

The same behavior is for docker file deployment.