Fallback to parent justfiles
If a recipe is not found in a justfile and the fallback setting is set,
just will look for justfiles in the parent directory and up, until it
reaches the root directory. just will stop after it reaches a justfile in
which the fallback setting is false or unset.
As an example, suppose the current directory contains this justfile:
set fallback
foo:
echo foo
And the parent directory contains this justfile:
bar:
echo bar
$ just bar
Trying ../justfile
echo bar
bar