MINOR: add Luke's key (#508)

diff --git a/KEYS b/KEYS
index 7bb6e30..96e49f0 100644
--- a/KEYS
+++ b/KEYS
@@ -1889,3 +1889,63 @@
 nD9d7UbaVsHNlKSwX68EBi33
 =pTO/
 -----END PGP PUBLIC KEY BLOCK-----
+
+pub   rsa4096 2023-05-03 [SC]
+      42EFF58EC9BDFD20FA7DF8B16CCECEFAC04AC304
+uid           [ultimate] Luke Chen (CODE SIGNING KEY) <showuon@apache.org>
+sig 3        6CCECEFAC04AC304 2023-05-03  Luke Chen (CODE SIGNING KEY) <showuon@apache.org>
+sub   rsa4096 2023-05-03 [E]
+sig          6CCECEFAC04AC304 2023-05-03  Luke Chen (CODE SIGNING KEY) <showuon@apache.org>
+
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=uEfj
+-----END PGP PUBLIC KEY BLOCK-----