Fix not found error for attestation build summary URL

[kachick]

When I used the https://github.com/rubygems/release-gem action with .github/workflows/release.yml, it displays the Build summary.

However it links to https://github.com/OWNER/REPO/actions/runs/.github/workflows/release.yml and displays Not Found error.
As far as I know, GitHub provides a list of workflow runs as https://github.com/OWNER/REPO/actions/workflows/release.yml.
Is this just a typo? Or github provides the runs link with several patterns?

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@segiddins ref: #5330

I'm posting this PR instead of creating an issue, for sharing the related code. I'm okay for this closed anytime. 🙇‍♂️

[segiddins]

Thanks, I will figure this out when I get back to work next week

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.37%. Comparing base (96cba03) to head (90c5750).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5365      +/-   ##
==========================================
- Coverage   97.14%   94.37%   -2.77%     
==========================================
  Files         458      458              
  Lines        9584     9643      +59     
==========================================
- Hits         9310     9101     -209     
- Misses        274      542     +268     

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