chore(runtime-api): make create-db-user job image configurable and include imagePullSecrets

[rbren]

Description

Make the image used by the runtime-api create-db-user Helm hook job configurable and include imagePullSecrets in the pod spec.

Changes:

• Template create-db-user job to use .Values.database.createJob.image with default postgres:14
• Add default under charts/runtime-api/values.yaml
• Include imagePullSecrets in the job pod spec for private registries
• Bump charts/runtime-api/Chart.yaml version to 0.1.12

Helm Chart Checklist

• I have updated the version field in Chart.yaml for each modified chart
• I have tested the chart upgrade path from the previous version
• I have verified backwards compatibility with existing values.yaml configurations
• I have updated the chart's README.md if there are any breaking changes or new required values

Additional Notes

• Backwards compatible: when no value is provided, it defaults to postgres:14 which was the previous hardcoded image.
• Example override:
  • values.yaml

    database:
      createJob:
        image: "bitnami/postgresql:14"

  • CLI: --set database.createJob.image=bitnami/postgresql:14

@rbren can click here to continue refining the PR