Run Docker test on Github Actions arm64 runners

[dereknola]

Proposed Changes

• Build both arm64 and amd64 versions of k3s artifacts in GHA
• Implement Docker Go Tests as a matrix of both Arm64 and Amd64 architectures.
• Consolidate Drone tests down to only be PR for arm (32bit) and tagging events (for publishing).
• Reduce failures for Skew and Upgrade tests on forks by moving away from git branch to a channel based flag (git history is too inconsistent on GHA runners and just source ./script/version.sh is easier)

Types of Changes

Testing Overhaul

Verification

CI is green
THIS ALL RUNS IN 5m 38s

Testing

Its all testing

Linked Issues

#11704

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.61%. Comparing base (f78769d) to head (2826094).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11705      +/-   ##
==========================================
- Coverage   49.89%   47.61%   -2.29%     
==========================================
  Files         185      185              
  Lines       19353    19353              
==========================================
- Hits         9656     9214     -442     
- Misses       8300     8804     +504     
+ Partials     1397     1335      -62     

Flag	Coverage Δ
e2etests	40.33% <ø> (-3.80%)	⬇️
inttests	35.00% <ø> (-0.06%)	⬇️
unittests	17.03% <ø> (ø)

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