Add GitHub Actions workflow for GKE deployment

[MakrandMZare]

This workflow builds a Docker container, publishes it to Google Container Registry, and deploys it to GKE on pushes to the main branch. It includes steps for authentication, Docker image building, and deployment configuration.

Description: Describe your changes.

Related issue: Add link to the related issue.

Check list:

• [x] Mark if documentation changes are required.
• [x] Mark if tests were added or updated to cover the changes.