Add Dockerfiles for core-service, token-service, and admin-portal

[MohamadNazik]

Purpose

Sets up Dockerfiles for the core-service, token-service, and admin-portal so the applications can be containerized and deployed on any container platform.

Goals

Provide production-ready container images for all three services, a docker-compose setup to verify them together locally, and a /health endpoint on core-service for liveness checks.

Approach

Added a multi-stage Dockerfile per service, a docker-compose.yml + .env.example to run all three locally against a MySQL instance, an entrypoint script for the admin-portal that injects runtime config via config.js, and a /health endpoint on core-service. Containers run as a non-root user and use restart: unless-stopped for resilience.

User stories

N/A

Release note

Add Docker image definitions for core-service, token-service, and admin-portal, enabling containerized deployment.

Documentation

N/A - no product documentation impact.

Training

N/A

Certification

N/A - no impact on certification exams.

Marketing

N/A

Automation tests

• Unit tests

  No unit test changes; infrastructure-only change.

• Integration tests

  Verified locally via docker-compose up that core-service, token-service, and admin-portal build and start correctly together against MySQL.

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? N/A (Dockerfile/infra change, no Java code)
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Samples

N/A

Related PRs

N/A

Migrations (if applicable)

N/A

Test environment

Docker Desktop on Windows 11, docker-compose

Learning

N/A

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.