chore: make pre-deployment changes

[harshithl1777]

Summary of Changes

• Added Dockerfile and .dockerignore
• Fixed CORS configuration in RelayApplication.java and added null checks in AuthenticationFilter.java

[muhammadIbrahim-cpu]

lgtm

[vivic04]

RelayApplication.java:
The addition of the CORS configuration is good for allowing specific origins. However, consider making the allowed origins configurable through properties or environment variables to allow easier updates without code changes.
It might be beneficial to create constants for the allowed origins to avoid hardcoding them directly in the code.
The CORS configuration could be moved to a separate class or package for better organization, especially if there are more configuration options in the future.

[vivic04]

AuthenticationFilter.java:
Instead of printing the social token to the console (System.out.println(socialToken)), consider using proper logging mechanisms for better visibility and maintainability.
It's a good practice to log the exception stack trace in case of an error to aid in debugging.
The check for a valid social token could be more robust. Ensure that the code handles all possible scenarios, and consider using a utility method or library for token validation.
The code for splitting the authorization header and checking for null could be refactored for clarity and to avoid potential issues.

[vivic04]

ci_test.yml:
The change in the GitHub Actions workflow to use JDK 21 is appropriate for keeping the development environment up to date.
Ensure that all necessary dependencies and plugins are compatible with JDK 21.
Consider adding comments explaining the reasons for choosing JDK 21 in the workflow file.

[vivic04]

After updating the JDK version, ensure that the application still builds and runs successfully. Check for any deprecated APIs or breaking changes.

[vivic04]

Overall seems good, a few minor changes and we are good to go!