GHSA-r6mh-qg79-rqj2: Gitea Helm chart upload decompression denial of service

When parsing an uploaded Helm chart, Gitea decompressed the archive and read every tar entry while looking for Chart.yaml without limiting the decompressed size, and did so before the package size quota was checked; the quota only considers the compressed upload size. A user with package write access to an owner, for example their own account on an instance with open registration, could repeatedly upload small, highly compressed archives that make the server spend CPU time proportional to the decompressed size, degrading the availability of the Gitea instance. The issue does not allow code execution or data access.