Add build check

[xkaper001]

Closes #

📝 Description

This pull request introduces a new GitHub Actions workflow to automate the build process for both Android and iOS platforms for two different applications: Patient and Therapist. The workflow includes separate jobs for building each application on each platform.

🔧 Changes Made

New GitHub Actions workflow:

• .github/workflows/pull_request.yml: Added a new workflow named "PR Workflow" that triggers on pull requests and manual dispatch. It includes jobs for building the Patient and Therapist applications for both Android and iOS platforms. Each job checks out the repository, sets up Flutter, touches the .env file, fetches dependencies, and builds the application.

📷 Screenshots or Visual Changes (if applicable)

✅ Checklist

• I have read the contributing guidelines.
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation (if applicable).
• Any dependent changes have been merged and published in downstream modules.