Docker image can't start

[pascalgrimaud]

Following this #10742, the Dockerfile is broken. So we could not deploy to GCP.

To reproduce:

docker build -t jhlite:local .

Then:

➜ docker run -p 7471:7471 jhlite:local
docker: Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: "exec": executable file not found in $PATH: unknown.