Dockerfile: Fix entrypoint
When running from gitlab-runner:
Using docker image sha256:77ae1... for registry.gitlab.com/csmos/containerhub/python-dev:latest with digest registry.gitlab.com/csmos/containerhub/python-dev@sha256:e24f... /bin/sh: /bin/sh: cannot execute binary file Cleaning up project directory and file based variables 00:00 ERROR: Job failed: exit code 126
More info: gitlab-org/gitlab-runner#2109 (comment 47480476)
Signed-off-by: Daniel Gomez dagmcr@gmail.com