"-dirty" suffix in the tiflash binary

[JaySon-Huang]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

introduced by #5797
There is a "dirty" in tiflash commit

>  LD_LIBRARY_PATH=. ./tiflash version
TiFlash
Release Version: v6.4.0-alpha-12-g38ea7f1-dirty     <-- "dirty" here
Edition:         Community
Git Commit Hash: 38ea7f10f07d60c7cf0c7d2716b966795107304e
Git Branch:      HEAD
UTC Build Time:  2022-10-10 08:48:55
Enable Features: jemalloc sm4 failpoints avx avx512 unwind
Profile:         Debug

Raft Proxy
Git Commit Hash:   7871067cd769cde028aed128cfdf38fe06414a90
Git Commit Branch: HEAD
UTC Build Time:    2022-09-21 11:10:05
Rust Version:      rustc 1.64.0-nightly (0f4bcadb4 2022-07-30)
Storage Engine:    tiflash
Prometheus Prefix: tiflash_proxy_
Profile:           debug

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiFlash version? (Required)