By default, ccache includes the modification time (mtime) and size of the compiler in the hash to ensure that results retrieved from the cache are accurate. But in CI environment compiler's mtime can be unique each run.
Effectively, this PR fixes #27063 (comment):
Looks like ccache isn't working here
By default, `ccache` includes the modification time (`mtime`) and size
of the compiler in the hash to ensure that results retrieved from the
cache are accurate. But in CI environment compiler's `mtime` can be
unique each run.
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