Add log artifact in main workflow with 30-day expiry

[sweep-ai[bot]]

Description

This PR adds a step to the main workflow that saves the logs as an artifact at the end of the workflow. Additionally, it sets the expiration date of the artifact to 30 days.

Summary of Changes

• Modified the .github/workflows/main.yml file to add a step that saves the logs as an artifact using the actions/upload-artifact action.
• Set the expiration date of the artifact to 30 days using the expires-in option in the actions/upload-artifact action.

Fixes #10.

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