Update ci

[lhy1024]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[codecov-commenter]

Codecov Report

Merging #28 (b24b32f) into master (86831ce) will decrease coverage by 0.14%.
Report is 27 commits behind head on master.
The diff coverage is 69.86%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   74.29%   74.16%   -0.14%     
==========================================
  Files         451      451              
  Lines       48863    49526     +663     
==========================================
+ Hits        36305    36730     +425     
- Misses       9349     9491     +142     
- Partials     3209     3305      +96     

Flag	Coverage Δ
unittests	74.16% <69.86%> (-0.14%)	⬇️

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