feature: add helm charts

[bas0N]

Fixes #2371

Background

Bank of Anthos currently requires manual deployment of individual YAML files, making local development cumbersome. Developers need to manage multiple manifests, hardcoded configurations, and GCP-specific settings that don't work well in local environments. This creates friction for contributors wanting to quickly spin up the application for testing or development.

Change Summary

• Created comprehensive Helm chart with parameterized templates for all Bank of Anthos services
• Configured local development defaults (monitoring disabled, GCP autoconfiguration excluded)
• Added proper resource management with configurable CPU/memory limits
• Implemented JWT authentication setup with clear documentation
• Added production-ready configuration options for easy environment switching

Additional Notes

The chart prioritizes local development experience while maintaining production flexibility. The SPRING_AUTOCONFIGURE_EXCLUDE configuration is intentionally used to bypass GCP services for local setups.

Testing Procedure

openssl genrsa -out jwtRS256.key 4096
openssl rsa -in jwtRS256.key -outform PEM -pubout -out jwtRS256.key.pub

kubectl create secret generic jwt-key --from-file=./jwtRS256.key --from-file=./jwtRS256.key.pub
helm install bank-of-anthos ./helm-charts/bank-of-anthos-chart

kubectl get pods
kubectl get services

Related PRs or Issues

None

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