docs: add container image verification

[pellared]

Towards #1201

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.29%. Comparing base (2b13ee5) to head (4c132d5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1325      +/-   ##
==========================================
+ Coverage   43.51%   44.29%   +0.77%     
==========================================
  Files         305      304       -1     
  Lines       32866    27745    -5121     
==========================================
- Hits        14303    12289    -2014     
+ Misses      17642    14723    -2919     
+ Partials      921      733     -188     

Flag	Coverage Δ
integration-test	?
integration-test-arm	?
integration-test-vm-x86_64-5.15.152	?
integration-test-vm-x86_64-6.10.6	?
k8s-integration-test	?
oats-test	?
unittests	44.29% <ø> (-0.01%)	⬇️

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