Ivan Grokhotkov b3b90d6a85 ci: disable ccache when running CMake build system tests
Some tests check if certain files are rebuilt when source files are
'touch'ed. With ccache, 'touch'ing source files doesn't cause a
rebuild, hence the test fails. In case IDF_CCACHE_ENABLE was set in
the environment, unset it before starting the tests.
2021-12-22 00:36:00 +01:00
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