The dockerfile test is used by test_editable, but should not be used
by the generated tests. Removing the verify script will prevent it
being run as part of the generated tests.
This test only verifies the option one way: a change inside the
container (a new file) is reflected in the local host repository
outside the container.
A further test where a modification at the host level is reflected in
the container, is still neede.
Bash scripts by default continue on executing even if any
command errors. That's not the behavior we want for our scripts,
so let's explicitly get them to fail if:
1. Any command exits with non 0 exit code
2. An undefined variable is referenced