* chore: add more files to ignore
Signed-off-by: STRRL <str_ruiling@outlook.com>

* chore: ignore .cache with license checker
Signed-off-by: STRRL <str_ruiling@outlook.com>
Co-authored-by: Yue Yang <g1enyy0ung@gmail.com>
Co-authored-by: Ti Chi Robot <ti-community-prow-bot@tidb.io>