API: POST `releases/{id}/assets` should accept `application/octet-stream`

[silverwind]

Feature Description

Adding release assets on GitHub's API accepts application/octet-stream while Gitea's API accepts multipart/form-data.

It should be made to accept both which is necessary for actions like ncipollo/release-action to work.

[KN4CK3R]

Strange that this essential endpoint is not Github compatible.