In 3350283bcc, a subtle bug was introduced
by renaming this variable. For image builds that go down the `else`
branch, they never set this variable, which is then referenced below
when constructing the `params` dict. This results in a very confusing
bug from the Docker backend when trying to construct images:
> An unexpected Docker error occurred: 500 Server Error for
> http+docker://localhost/v1.51/build?t=molecule_local%2Fubuntu%3A24.04&q=False&nocache=False&rm=True&forcerm=True&pull=True&dockerfile=%2Fhome%2Fci%2F.ansible%2Ftmp%2Fmolecule.IaMj.install-github%2FDockerfile_ubuntu_24_04:
> Internal Server Error ("Cannot locate specified Dockerfile:
> /home/ci/.ansible/tmp/molecule.IaMj.install-github/Dockerfile_ubuntu_24_04")
Within the Docker daemon logs, the actual error presents itself like
this:
> level=debug msg="FIXME: Got an API for which error does not match any
> expected type!!!" error="Cannot locate specified Dockerfile:
> $HOME/.ansible/tmp/molecule.5DrS.install-package/Dockerfile_ubuntu_24_04"
> error_type="*errors.fundamental" module=api
Unfortunately, these are all red herrings and the actual cause of the
problem isn't Docker itself or the missing file, but in fact the
`docker_image` module not passing the correct parameter data here.
9d7dda7292