e2e/assertion auth tests failing at HEAD

[alexeagle]

https://github.com/bazel-contrib/rules_oci/actions/runs/12284744849/job/34281215802#step:11:4129

is hitting

#   	File "/home/runner/.cache/bazel/_bazel_runner/ea21e3005722cc640d59cb12d97976aa/execroot/_main/_tmp/438cdd37bacdd04ffce3fcb15a4fe39d/_bazel_runner/25a5255494663907bdd745642374734a/external/rules_oci~/oci/private/pull.bzl", line 151, column 13, in _download_manifest
#   		fail(
#   Error in fail: Unable to retrieve the image manifest. This could be due to
#   *) Authentication problems. Check if `docker pull` command succeeds with same parameters.
#   *) If there is a configured URL Rewriter, check that it does not block the request.

going to disable the test for now to green up main for PRs, but one of us will have to investigate and re-enable.