feat: add CI workflow

[AmrElsayyad]

This PR adds a new CI workflow to our GitHub Actions.

Workflow Details

The workflow includes the following key features:

• Uses Ubuntu as the runner
• Sets up JDK 17
• Caches Maven packages for faster builds
• Sets up a MySQL database for testing
• Decodes and uses a secret APPLICATION_TEST_PROPERTIES for test configuration
• Uploads test coverage to Codecov

Required Actions

Before merging this PR, please ensure the following steps are completed:

1. Encode the application-test.properties file:

   cd src/main/resources/
   base64 application-test.properties > application-test.properties.base64
   

2. Add the encoded content as a GitHub Secret:

   • Go to the repository settings
   • Navigate to "Secrets and variables" > "Actions"
   • Click "New repository secret"
   • Name: APPLICATION_TEST_PROPERTIES
   • Value: [Paste the content of application-test.properties.base64]

3. Set up Codecov:

   • Visit https://about.codecov.io/
   • Set up Codecov for this repository
   • Add the Codecov token as a GitHub Secret named CODECOV_TOKEN

Please review the workflow and let me know if any changes are needed.