[Helm] Skip PostgreSQL hooks and jobs when postgresql.enabled is false

[kishorek07]

Problem

When using an external PostgreSQL instance and setting postgresql.enabled=false in values.yaml, the Airflow Helm chart still renders and deploys PostgreSQL-related resources such as:

• Migration jobs
• Helm hooks (pre-install, post-upgrade)
• Cleanup jobs

This causes errors during deployment and breaks compatibility with external PostgreSQL setups.

Solution

Wrapped PostgreSQL-specific templates with a conditional check:

• if .Values.postgresql.enabled
  • PostgreSQL-related Job / Hook definitions
• end

This ensures PostgreSQL hooks and jobs are skipped when PostgreSQL is disabled.

[boring-cyborg]

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[jedcunningham]

Closing. There are no changes in this PR.

Though, the hooks/jobs intentionally run even with an external postgres instance. Not opposed to having a way to disable them, but it cannot be that config option.