🌱 Skip cosign confirmation prompt during publishimage action.

[spencerschrock]

What kind of change does this PR introduce?

(Is it a bug fix, feature, docs update, something else?)

• PR title follows the guidelines defined in our pull request documentation

What is the current behavior?

the cosign step fails since it asks for a confirmation prompt:

By typing 'y', you attest that (1) you are not submitting the personal data of any other person; and (2) you understand and agree to the statement and the Agreement terms at the URLs listed above.
Are you sure you would like to continue? [y/N] Error: signing [ghcr.io/ossf/scorecard/v4:f3b777086fb670ed5b10b4d1d7257786d0daa6d6]: recursively signing: signing digest: should upload to tlog: user declined the prompt
main.go:74: error during command execution: signing [ghcr.io/ossf/scorecard/v4:f3b777086fb670ed5b10b4d1d7257786d0daa6d6]: recursively signing: signing digest: should upload to tlog: user declined the prompt
Error: Process completed with exit code 1.

What is the new behavior (if this is a feature change)?**

cosign sign is called with the --yes flag.

  -y, --yes   skip confirmation prompts for non-destructive operations

• Tests for the changes have been added (for bug fixes/features)

Which issue(s) this PR fixes

NONE

Special notes for your reviewer

Does this PR introduce a user-facing change?

For user-facing changes, please add a concise, human-readable release note to
the release-note

(In particular, describe what changes users might need to make in their
application as a result of this pull request.)

NONE

[codecov]

Codecov Report

Merging #2918 (ad60980) into main (813e9c6) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

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  Misses       5337     5337           
  Partials      370      370