Merge branch 'feature/rooted-images' of github.com:nationalarchives/d…

…ocker into feature/rooted-images

.github/workflows/remove-untagged.yml

@@ -21,7 +21,7 @@ jobs:
               { per_page: ${{ env.PER_PAGE }}
             });
             for(version of response.data) {
-                if (version.metadata.container.tags.length == 0) {
+                if (version.metadata.container.tags.length == 0 && version.name !== "latest" && version.name !== "preview") {
                     console.log("Delete " + version.id)
 
                     const deleteResponse = await github.request("DELETE /orgs/${{ github.repository_owner }}/packages/container/${{ matrix.image-name }}/versions/" + version.id, { });