Description
This commit introduces new functionality to support external secrets for the KubeRocketCI Gerrit Operator. It adds configurations and templates for managing secrets using AWS or generic providers via the External Secrets Operator. Key features include the ability to configure secret providers, specify secret store names, and manage Keycloak integration for SSO.

Fixes # (issue)

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

The changes have been tested by deploying the updated Helm chart in a staging environment. The following tests were performed:

Verification of secret creation using both AWS Parameter Store and Secrets Manager.
Validation of Keycloak integration with the Gerrit SSO.
Ensured that existing deployments without external secrets continue to function without issues.
Steps to reproduce:

Deploy the updated Helm chart with externalSecrets.enabled set to true.
Configure the externalSecrets.type to either aws or generic.
Verify that the ExternalSecrets and SecretStores are created as expected.
Test the Keycloak SSO login flow.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes