Add IBM Cloud Container Registry to tested registry list

Signed-off-by: Jack Baines bainsy88@gmail.com #1855
sigstore · May 10, 2022 · 1121b1a · 1121b1a
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@@ -306,6 +306,7 @@ Today, `cosign` has been tested and works against the following registries:
 * Alibaba Cloud Container Registry
 * Red Hat Quay Container Registry 3.6+ / Red Hat quay.io
 * Elastic Container Registry
+* IBM Cloud Container Registry
 
 We aim for wide registry support. To `sign` images in registries which do not yet fully support [OCI media types](https://github.com/sigstore/cosign/blob/main/SPEC.md#object-types), one may need to use `COSIGN_DOCKER_MEDIA_TYPES` to fall back to legacy equivalents. For example:
 ```shell