Quarkus + GitHub Actions: Reducing CI Time by Half Without Larger Runners

A walkthrough of how we cut Backbone's build+test workflow roughly in half: LocalStack to Floci, fewer Quarkus boots, infrastructure-aware integration job splits, Temurin instead of Graal for non-native CI, and skipping quarkus:build when @QuarkusTest does not need a runner jar - with Maven wall-clock lines taken from real GitHub Actions logs.