bump artifacts v3->v4

[hellt]

podman started to fail, presumably because gh actions moved to some azure sourced package repos and podman in general started to poop

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c777995) 51.15% compared to head (89a37df) 48.52%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1792      +/-   ##
==========================================
- Coverage   51.15%   48.52%   -2.63%     
==========================================
  Files         147      147              
  Lines       14228    14230       +2     
==========================================
- Hits         7278     6905     -373     
- Misses       6131     6555     +424     
+ Partials      819      770      -49     

Files	Coverage Δ
cmd/exec.go	73.11% <100.00%> (+0.59%)	⬆️
runtime/ignite/ignite.go	0.31% <0.00%> (ø)

... and 8 files with indirect coverage changes