Fix nightly tests

[dereknola]

Proposed Changes

• opensuse leap 15.6+ image no longer has ps installed by default
• Fixes issue around rke2-killall.sh being in different locations depending on OS.

Types of Changes

Test Fix

Verification

Nightly Install now passes
https://github.com/dereknola/rke2/actions/runs/12894519908

Testing

Linked Issues

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 8.74%. Comparing base (649521a) to head (411bfc6).
Report is 4 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (649521a) and HEAD (411bfc6). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (649521a)	HEAD (411bfc6)
unittests	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #7630       +/-   ##
==========================================
- Coverage   23.00%   8.74%   -14.26%     
==========================================
  Files          34      34               
  Lines        3500    3500               
==========================================
- Hits          805     306      -499     
- Misses       2647    3171      +524     
+ Partials       48      23       -25     

Flag	Coverage Δ
inttests	8.74% <ø> (ø)
unittests	?

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