[minor] Add external database support for AIService

[Divyesh-Khokhar]

Summary

Adds support for external databases (Oracle, SQL Server, external DB2) to AI Service installation commands, allowing users to bring their own database instead of requiring in-cluster DB2 installation. And fix test failure as well for AIService.

Changes

New CLI Flags

Standalone Command: mas aiservice-install

--db2-aiservice                      # Install DB2 in-cluster (optional flag)
--aiservice-db-jdbc-url <url>        # External database JDBC URL
--aiservice-db-username <username>   # External database username
--aiservice-db-password <password>   # External database password
--aiservice-db-ca-cert <pem-cert>    # External database CA certificate content in PEM format (optional)

Combined Command: mas install

Same flags available when installing AI Service via mas install command.

Usage Examples

Install with in-cluster DB2 (default - no flags needed):

mas aiservice-install \
  --mas-instance-id mymas \
  --aiservice-instance-id aiservice1

Install with in-cluster DB2 (explicit):

mas aiservice-install \
  --mas-instance-id mymas \
  --aiservice-instance-id aiservice1 \
  --db2-aiservice

Install with external database (Oracle, SQL Server, or DB2):

mas aiservice-install \
  --mas-instance-id mymas \
  --aiservice-instance-id aiservice1 \
  --aiservice-db-jdbc-url "jdbc:oracle:thin:@//oracle.example.com:1521/ORCL" \
  --aiservice-db-username aiservice_user \
  --aiservice-db-password "mypassword" \
  --aiservice-db-ca-cert "-----BEGIN CERTIFICATE-----...-----END CERTIFICATE-----"

Note: The same command structure works for SQL Server and DB2 - just change the JDBC URL:

• SQL Server: jdbc:sqlserver://hostname:1433;databaseName=aiservice
• DB2: jdbc:db2://hostname:50000/aiservice

Interactive Mode Support

Step 1: Database Configuration Choice

14) Database Configuration
By default, DB2 will be installed in-cluster (suitable for development and testing).
Alternatively, you can connect to an external database (Oracle, SQL Server, or DB2).

Do you want to use an external database? [y/n]

If user selects 'n' (In-cluster DB2):

Db2 Universal Operator for v12 onwards requires a License activation key
If you don't have a license, press enter to continue.

If user selects 'y' (External Database):

14.1) External Database Configuration
Provide connection details for your external database.

JDBC URL Examples:
  Oracle:     jdbc:oracle:thin:@//hostname:1521/servicename
  SQL Server: jdbc:sqlserver://hostname:1433;databaseName=aiservice
  DB2:        jdbc:db2://hostname:50000/database

Database JDBC URL: [user input]
Database Username: [user input]
Database Password: [hidden input]
Does the database use SSL/TLS with a self-signed certificate? [y/n]

If SSL/TLS with self-signed certificate is selected:

Database CA Certificate (PEM format): [user input - paste PEM certificate content directly]

Test results

AIService with MAS and Manage install pipeline:

Standalone AIService install pipeline:

Related PRs

ibm-mas/ansible-devops#2336
ibm-mas/python-devops#404

Related Issues

https://jsw.ibm.com/browse/MASAIB-2388