Add Cloud Run workflow file

[ChingEnLin]

This pull request introduces a new GitHub Actions workflow for continuous deployment to Google Cloud Run. The workflow automates the process of building a Docker image, pushing it to Google Artifact Registry, and deploying it to Cloud Run whenever changes are pushed to the "production" branch.

New CI/CD workflow for Google Cloud Run deployment:

• Added .github/workflows/google-cloudrun-docker.yml to automate Docker build, push to Google Artifact Registry, and deployment to Cloud Run on pushes to the "dev" branch. The workflow uses Workload Identity Federation for authentication and outputs the deployed service URL.

[Copilot]

Pull Request Overview

This PR adds a GitHub Actions CI/CD workflow to automate deployment of a Docker-based application to Google Cloud Run. However, there's a mismatch between the PR description and the actual workflow configuration.

• Adds a new workflow file for continuous deployment to Google Cloud Run
• Configures Docker image building and pushing to Google Artifact Registry
• Sets up deployment for both backend and frontend services with environment variables

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