fix the error lstat /github/workspace: no such file or directory

[zhzhuang-zju]

What type of PR is this?
failed ci link:
https://github.com/karmada-io/karmada/actions/runs/11399514762/job/31718886970

refer to aquasecurity/trivy-action#404 (comment), replacing scan-ref: /github/workspace/ with scan-ref: ${{ github.workspace }}/ to fix the problem.

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
local verification：
https://github.com/zhzhuang-zju/karmada/actions/runs/11400139818/job/31720357994

Does this PR introduce a user-facing change?:

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All modified and coverable lines are covered by tests ✅

Project coverage is 39.74%. Comparing base (2fe8570) to head (d41a8cd).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5709      +/-   ##
==========================================
- Coverage   39.74%   39.74%   -0.01%     
==========================================
  Files         650      650              
  Lines       55125    55125              
==========================================
- Hits        21911    21907       -4     
- Misses      31806    31809       +3     
- Partials     1408     1409       +1     

Flag	Coverage Δ
unittests	39.74% <ø> (-0.01%)	⬇️

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[zhzhuang-zju]

assign @RainbowMango

[RainbowMango]

Asking again, is this an official solution?

[zhzhuang-zju]

Asking again, is this an official solution?

I'm not certain if this is the official solution, but after investigation, I found that this is a correct approach. The latest version of trivy-action works by executing the trivy command, where the flag scan-ref indicates the reference to be scanned. In our use case, it should be the download path of the Karmada repository. Since the action checkout checks out our repository under $GITHUB_WORKSPACE, setting scan-ref to $GITHUB_WORKSPACE should work without any issues.

[RainbowMango]

/lgtm
/approve

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