Implement typed error for docker runner: ErrNoImage

[intojhanurag]

Changes

• Introduced ErrNoImage as a typed error in docker runner.
• Updated runner.Run() to return ErrNoImage when function image is missing.
• Updated integration test to use errors.As() for type-safe checking.

[knative-prow]

Hi @intojhanurag. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.06%. Comparing base (1eb546a) to head (2b45241).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/docker/runner.go	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3123      +/-   ##
==========================================
+ Coverage   58.33%   59.06%   +0.73%     
==========================================
  Files         134      134              
  Lines       17367    17369       +2     
==========================================
+ Hits        10131    10259     +128     
+ Misses       6298     6144     -154     
- Partials      938      966      +28     

Flag	Coverage Δ
e2e-tests	40.25% <0.00%> (+1.29%)	⬆️
integration-tests	53.89% <33.33%> (+1.61%)	⬆️
unit-tests	46.22% <33.33%> (-0.01%)	⬇️

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[intojhanurag]

Hey @gauron99 , It is ready for review.

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: intojhanurag, lkingland

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