Add additional troubleshooting entry for Ancestor hash not determinable #642
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When running LHCI in GH Actions due to how checkout action clones the repo with a fetch depth of 1 by default the base branch might be missing so LH will not be able to find it during health check.
Changing the action settings and fetching the base using a new step will fix this problem for almost all cases where the repo is big enough.
This has been discussed here actions/checkout#93 and here actions/checkout#213