Enable build image trigger based on tags with -rc suffix

[eguzki]

Fix coming from #1105

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.54%. Comparing base (cc1b41f) to head (c981230).
Report is 82 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1107      +/-   ##
==========================================
+ Coverage   76.15%   83.54%   +7.39%     
==========================================
  Files         111       81      -30     
  Lines        8986     6764    -2222     
==========================================
- Hits         6843     5651    -1192     
+ Misses       1852      893     -959     
+ Partials      291      220      -71     

Flag	Coverage Δ
bare-k8s-integration	15.58% <ø> (+4.70%)	⬆️
controllers-integration	75.90% <ø> (+17.03%)	⬆️
envoygateway-integration	40.54% <ø> (+8.04%)	⬆️
gatewayapi-integration	16.19% <ø> (+2.75%)	⬆️
istio-integration	43.65% <ø> (+9.32%)	⬆️
unit	20.05% <ø> (-5.31%)	⬇️

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Components	Coverage Δ
api/v1beta1 (u)	90.00% <100.00%> (-2.19%)	⬇️
api/v1beta2 (u)	∅ <ø> (∅)
pkg/common (u)	∅ <ø> (∅)
pkg/istio (u)	62.06% <ø> (+15.03%)	⬆️
pkg/log (u)	93.18% <ø> (ø)
pkg/reconcilers (u)	24.67% <ø> (∅)
pkg/rlptools (u)	∅ <ø> (∅)
controllers (i)	86.92% <89.91%> (+2.49%)	⬆️

see 47 files with indirect coverage changes