e2e/assertion auth tests failing at HEAD

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.