ci: cache PR build results based on git tree hash #119
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So currently, a branch gets built at lest three times: first on the PR, second in the merge queue and third for the master push event.
This PR adds result caching to the "CI build step" that caches positive build results.
edit So it turns out that there are quite strict restrictions on inter-branch cache access. "main" builds cannot access caches generated from child branches (PRs). :(