When using URL to a git repo as build context allow specifying `commit`
to make sure specific `commit` is used as the build context.
Examples
```console
buildah build -t test myrepo.git#abcef123
buildah build -t test myrepo.git#abcef123
buildah build -t test myrepo.git#abcef123:somesubdir
```
Closes: https://github.com/containers/buildah/issues/4148
Signed-off-by: Aditya R <arajan@redhat.com>
When the build context is specified as a subdirectory in a Git
repository, we were cloning the repository to start, but only removing
the subdirectory when we were finished with it. We should be removing
the whole clone.
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
When testing that we can handle contexts that are described using the
git:// protocol, launch a local git-daemon with a minimal repository to
point the binary at instead of github, which doesn't do that any more.
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
Aditya R
Nalin Dahyabhai