builder: bind child outputs to parent
builder: bind child outputs to parent

make sure the a child nodes outputs are bound to the parent dir
this right now is achieved by symlinking outputs of one thing to the
other. This is mainly because it is important to have a fallback cause
macOS doesn't support containers.

Signed-off-by: Sevki <a0f1490a20d0211c997b44bc357e1972deab8ae3@sevki.org>

bldy/build,bldy/build,bldy/build,bldy/build