feat(gitea): add development-values.yaml for headless installation support

Summary

The gitea application is missing a development-values.yaml file (a ConfigValues kind) that would enable headless installations and CI/CD automation via kubectl kots install --config-values.

Context

The storagebox application in this monorepo establishes a "four-way contract" pattern between:

1. development-values.yaml - ConfigValues for headless installations
2. kots/kots-config.yaml - Admin Console configuration UI
3. kots/<app>-chart.yaml - HelmChart CR with KOTS template functions
4. charts/<app>/values.yaml - Base Helm chart values

The gitea application currently has items 2-4 but is missing item 1. This was identified during the Bitnami-to-CNPG/Valkey migration (replacing Bitnami PostgreSQL and Redis with CloudNativePG and Valkey).

Proposed File

Create applications/gitea/development-values.yaml:

apiVersion: kots.io/v1beta1
kind: ConfigValues
metadata:
  name: gitea-config-values
spec:
  values:
    internal_postgres_enabled:
      default: "1"
      value: "1"
    postgres_db:
      default: "gitea"
      value: "gitea"
    postgres_user:
      default: "gitea"
      value: "gitea"
    postgres_password:
      default: "gitea"
      value: "gitea"
    postgres_host:
      default: "gitea-postgres-rw:5432"
      value: "gitea-postgres-rw:5432"
    internal_valkey_enabled:
      default: "1"
      value: "1"
    valkey_password:
      default: "changeme"
      value: "changeme"

Benefits

• Enables headless installation for CI/CD pipelines
• Maintains consistency with the storagebox four-way contract pattern
• Documents expected default values in a machine-readable format

Create applications/gitea/development-values.yaml as a ConfigValues resource. Compare the storagebox development-values.yaml pattern with applications/gitea/kots/kots-config.yaml, applications/gitea/kots/-chart.yaml, and charts/gitea/values.yaml, then verify the listed PostgreSQL and Valkey values support the documented kubectl kots install --config-values workflow.