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Use ccache in CIs. Set up GitHub Cache for storing the ccache data.
TODO:
Ubuntu / [email protected] has 60% cache miss rate for unknown reasons.The reason seems to be the cache size was too small.The CleanUpCache workflow does not work. It is supposed to triggered by the the completion of "👑 CI". But either the space (between the crown and the word CI) or the emoji is causing issues.The reason is this PR has not been merged yet. So the default branch does not have the workflow. (It would be a security issue if it updates cache according to a PR's instruction.)