Draft: Trigger push rules for the first push
What does this MR do and why?
Contributes to #356094 (closed)
Problem
On Gitaly side we use git diff-tree
to access list of changed paths.
It tries to detect diff between provided commit and its parent. But
during the first push, the commit doesn't have a parent, because of that
git diff-tree
returns an empty result.
Solution
To correctly access a list of changed files for the first commit we should provide a special empty tree id that exists for every repository.
We also need to use a different request because we compare tree objects instead of commit objects.
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