Feature Request: Add official support for PostgreSQL 16, 17, and 18 in Harbor Helm Chart

Is your feature request related to a problem?

Our organization is deploying Harbor using the official Helm chart with an external PostgreSQL database.

While the Harbor documentation mentions support for external PostgreSQL (12 or later), it does not explicitly validate or document support for PostgreSQL 16, 17, and 18. Our organization requires using the latest PostgreSQL major versions to meet security, compliance, and infrastructure standardization requirements.

Describe the solution you'd like

Please add official support and validation for PostgreSQL 16, 17, and 18 when deploying Harbor using the official Helm chart with an external PostgreSQL database.

Why is this needed?

• Organizations are adopting newer PostgreSQL major versions as part of their standard platform.
• Using the latest supported database versions provides access to security updates, performance improvements, and long-term support.
• Official compatibility documentation would help users confidently deploy Harbor with newer PostgreSQL releases.

Expected behavior

• Official support for PostgreSQL 16, 17, and 18.
• Validation of Harbor against these PostgreSQL versions.
• Update the Harbor documentation and support matrix to include the validated PostgreSQL versions.
• Document any configuration changes or migration considerations, if applicable.

Environment

• Harbor Version: 2.15.2
• Deployment Method: Official Harbor Helm Chart
• Database: External PostgreSQL
• Requested PostgreSQL Versions: 16, 17, 18

Additional context

Our platform standard mandates the use of the latest PostgreSQL major versions. Currently, the lack of official support or compatibility validation for PostgreSQL 16, 17, and 18 prevents us from adopting newer PostgreSQL releases for Harbor deployments.