[Release-1.31] Migrate release pipeline into GitHub Actions

[dereknola]

Proposed Changes

Backports of:

• Migrate dispatch pipeline into GitHub Actions #13105
• Migrate K3s DockerHub image publishing from Drone to GitHub Actions #13129

Types of Changes

Verification

Testing

Linked Issues

#12136

User-Facing Change

Further Comments

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 21.47%. Comparing base (6486342) to head (2340b87).

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.31   #13118      +/-   ##
================================================
- Coverage         21.48%   21.47%   -0.01%     
================================================
  Files               188      188              
  Lines             15440    15440              
================================================
- Hits               3317     3316       -1     
- Misses            11685    11686       +1     
  Partials            438      438              

Flag	Coverage Δ
unittests	21.47% <ø> (-0.01%)	⬇️

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