Los permisos que se pueden aplicar dentro de una Azure Shared Image Gallery utilizan la jerarquía RBAC, en este caso tendríamos a diferentes niveles:

A nivel de Gallery

Get Gallery Microsoft Compute Galleries Gets the properties of Gallery

Microsoft.Compute/galleries/read

Create or Update Gallery Microsoft Compute Galleries Creates a new Gallery or updates an existing one

Microsoft.Compute/galleries/write

Delete Gallery Microsoft Compute Galleries Deletes the Gallery

Microsoft.Compute/galleries/delete

A nivel de Gallery Image

Get Gallery Image Microsoft Compute GalleryImages Gets the properties of Gallery Image

Microsoft.Compute/galleries/images/read

Create or Update Gallery Image Microsoft Compute GalleryImages Creates a new Gallery Image or updates an existin…

Microsoft.Compute/galleries/images/write

Delete Gallery Image Microsoft Compute GalleryImages Deletes the Gallery Image

Microsoft.Compute/galleries/images/delete

A nivel de Gallery Image Version

Get Gallery Image Version Microsoft Compute GalleryImageVersions Gets the properties of Gallery Image Version

Microsoft.Compute/galleries/images/versions/read

Create or Update Gallery Image Version Microsoft Compute GalleryImageVersions Creates a new Gallery Image Version or updates

Microsoft.Compute/galleries/images/versions/write

Delete Gallery Image Version Microsoft Compute GalleryImageVersions Deletes the Gallery Image Version

Microsoft.Compute/galleries/images/versions/delete