enhance chart ci

[zhzhuang-zju]

What type of PR is this?
/kind flake

What this PR does / why we need it:
enhance chart ci

Which issue(s) this PR fixes:

Fixes #6915

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.43%. Comparing base (181bffc) to head (3639842).
⚠️ Report is 2 commits behind head on master.
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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6935   +/-   ##
=======================================
  Coverage   46.43%   46.43%           
=======================================
  Files         698      698           
  Lines       47787    47788    +1     
=======================================
+ Hits        22189    22191    +2     
  Misses      23929    23929           
+ Partials     1669     1668    -1     

Flag	Coverage Δ
unittests	46.43% <ø> (+<0.01%)	⬆️

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[zhzhuang-zju]

By pre-pulling the image and measuring the time spent, we found that image pulling is relatively fast and unlikely to be the cause of CI failures. Instead, memory constraints are more likely responsible. Therefore, we will adjust the strategy by adding a disk space cleanup step.

[RainbowMango]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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