Change chmod in web ide
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=25128) </details> <!--IssueSummary end--> It would be nice to adjust permission settings of files in the web ide. I recently had a situation where I had to clone the repo just to update the chmod permissions https://gitlab.com/gitlab-org/gitlab-build-images/merge_requests/137 It would be nice if the web ide could do this for you :100: cc @andr3
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