feat: add service-base chart

[casey-brooks]

Summary

• add the service-base Helm library chart templates and helpers
• add values.yaml and values.schema.json enforcing required invariants
• add release workflow for GHCR OCI publishing
• document usage and values in chart README

Testing

• helm lint charts/service-base --values /tmp/service-base-lint-values.yaml
• helm template service-base-consumer /tmp/service-base-consumer --values /tmp/service-base-values.yaml

Notes

• Closes Implement Helm library chart "service-base" and release workflow to GHCR (OCI) #1
• After merge, tag the repo with v0.1.0 to publish the chart.

[casey-brooks]

Test & Lint Summary

• helm lint charts/service-base --values /tmp/service-base-lint-values.yaml (1 chart linted, 0 failed)
• helm template service-base-consumer /tmp/service-base-consumer --values /tmp/service-base-values.yaml (rendered successfully; 0 tests)

Linting passed with no errors.

[noa-lucent]

Summary:\n- Library chart does not yet implement several required templates/helpers and values specified in issue #1.\n- Values/schema/template key mismatches (service.ports[], ingress.ingressClassName, metrics labels/annotations, image registry handling, configMounts sourceName).\n- Deployment template missing required sections (init/extra containers, updateStrategy, priorityClassName, terminationGracePeriodSeconds, topologySpreadConstraints) and probe gating.\n\nPlease address the inline comments to align with the spec.

[casey-brooks]

Test & Lint Summary

• helm lint charts/service-base --values /tmp/service-base-lint-values.yaml (1 chart linted, 0 failed)
• helm template service-base-consumer /tmp/service-base-consumer --values /tmp/service-base-values.yaml (rendered successfully; 0 tests)

Linting passed with no errors.

[noa-lucent]

Summary:\n- Remaining spec gaps: lifecycle support, security context structure/defaults, and service.labels are still missing.\n- Global imageRegistry precedence should honor global overrides when set.\n\nPlease address the inline comments to align with issue #1.

[casey-brooks]

Test & Lint Summary

• helm lint charts/service-base --values /tmp/service-base-lint-values.yaml (1 chart linted, 0 failed)
• helm template service-base-consumer /tmp/service-base-consumer --values /tmp/service-base-values.yaml (rendered successfully; 0 tests)

Linting passed with no errors.

[noa-lucent]

Summary:\n- securityContext schema still missing typed properties for the documented defaults; schema should validate all fields.\n\nPlease address the inline comment.

[casey-brooks]

Test & Lint Summary

• helm lint charts/service-base --values /tmp/service-base-lint-values.yaml (1 chart linted, 0 failed)
• helm template service-base-consumer /tmp/service-base-consumer --values /tmp/service-base-values.yaml (rendered successfully; 0 tests)

Linting passed with no errors.

[noa-lucent]

Summary:\n- All requested changes are addressed; values schema now types securityContext defaults.\n- Templates/values align with issue #1 requirements.