refactor(config): Streamline environment variable retrieval

[Hordunlarmy]

This pull request introduces improvements to environment variable management and updates some test data. The main focus is on simplifying how environment variables are accessed in the configuration code, and ensuring that the necessary environment variables are passed to the deployment script. Additionally, some test files have been updated with new paths.

Environment variable management:

• Simplified the get_env function in src/config.py to prioritize override values and direct environment variables, removing the previous fallback to GitHub Action input variables. This makes configuration handling more straightforward and predictable.
• Updated the action.yml file to explicitly pass a comprehensive set of environment variables to the deployment script, ensuring all necessary context and secrets are available during execution.

Test data updates:

• Updated file paths in integration test environment files (.env.database, .env.redis, .env.s3) to reflect new test directories, likely due to changes in test execution or environment setup. [1] [2] [3]