build: add the healed-path option

This is necessary in the unit tests, to ensure each test case use a
different exercises directory.

Update test/tests.zig to use the new healed-path option, ensuring that
each temp directory is removed.

In test case 3, 4 and 5, move case_step as the first step in the
dependency chain.  This will improve the build summary tree.

In test case 5, remove the dependency to heal_step, since it is not
necessary.

0 files changed, 0 insertions, 0 deletions