fix: Ensure ALB action has weight 0 marshalled correctly

[dthomson25]

closes #491

[codecov]

Codecov Report

Merging #493 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #493   +/-   ##
=======================================
  Coverage   85.65%   85.65%           
=======================================
  Files          85       85           
  Lines        7920     7920           
=======================================
  Hits         6784     6784           
  Misses        814      814           
  Partials      322      322           

Impacted Files	Coverage Δ
utils/ingress/ingress.go	100.00% <ø> (ø)
ingress/alb.go	96.55% <100.00%> (ø)
rollout/trafficrouting/alb/alb.go	97.33% <100.00%> (ø)

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