Sign images using cosign

[waybackarchiver]

Issue Ticket Number

Close #193

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Checklist

• I have followed the contributing guidelines of this project as mentioned in CONTRIBUTING.md
• I have checked to ensure there aren't other open Pull Requests for the same update/change?
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes needed to the documentation

[codecov]

Codecov Report

Base: 45.51% // Head: 45.51% // No change to project coverage 👍

Coverage data is based on head (abbf15f) compared to base (046824c).
Patch has no changes to coverable lines.

❗ Current head abbf15f differs from pull request most recent head 2057566. Consider uploading reports for the commit 2057566 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #238   +/-   ##
=======================================
  Coverage   45.51%   45.51%           
=======================================
  Files          40       40           
  Lines        4998     4998           
=======================================
  Hits         2275     2275           
  Misses       2445     2445           
  Partials      278      278           

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