Add GitHub Action to check image upload sizes

[rahulsunil2]

Add GitHub Action to check image upload sizes

Description

This PR introduces a new GitHub Action workflow that automatically checks the size of image files (jpg, jpeg, png, gif) uploaded in pull requests. The workflow enforces a maximum file size limit of 5MB for all new or modified images. If any image exceeds this limit, the workflow will fail and provide a list of oversized images, helping to maintain repository size and ensure efficient loading of images in the project.

Key features of this workflow:

• Triggers on pull requests that modify image files
• Checks only new or modified images
• Enforces a 5MB size limit (configurable via environment variable)
• Provides clear error messages with file names and sizes for any oversized images
• Allows the workflow to pass if all images are within the size limit

References

• GitHub Actions documentation on workflow syntax
• Best practices for repository management

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

[linux-foundation-easycla]

• ✅login: rahulsunil2 / (0f66c6a)
• ✅login: rahulsunil2 / (0f66c6a, ab0e82c)

The committers listed above are authorized under a signed CLA.

[rahulsunil2]

This fixes: #633

[curfew-marathon]

This PR has had no human activity for 90 days, so it has been marked lifecycle/stale.

This is automated backlog grooming, not a judgment on the work.

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