ci: change protoc install script in ci

fix ci for protoc

Signed-off-by: jokemanfire <hu.dingyang@zte.com.cn>

Author: jokemanfire

.gitignore

@@ -10,3 +10,4 @@ example/protocols/**/*.rs
 example2/protocols/**/*.rs
 !example2/protocols/**/mod.rs
 src/ttrpc.rs
+example2/protocols/**/*.rs