http://dacxzjk3kq5mmepbdd3ai2ifynlzxsnpl2cnkfhridqfywihrfftapid.onion/help/ci/yaml/includes.md
This merge method is a deep merge , where hash maps are merged at any depth in the
configuration. To merge hash map "A" (that contains the configuration merged so far) and "B" (the next piece
of configuration), the keys and values are processed as follows:
When the key only exists in A, use the key and value from A.