ci: add a ML model artifact test case

Both as a test and an example.

Inspired by:
    https://github.com/kubeflow/model-registry/blob/main/docs/logical_model.md

Signed-off-by: Ramkumar Chinchani <[email protected]>

test/blackbox/pushpull_authn.bats

@@ -173,3 +173,20 @@ EOF
     [ "$status" -eq 0 ]
     [ $(echo "${lines[-1]}" | jq '.manifests | length') -eq 0 ]
 }
+
+@test "ML artifacts" {
+  # download model data
+  curl -v -L0 https://github.com/tarilabs/demo20231212/raw/main/v1.nb20231206162408/mnist.onnx -o ${BATS_FILE_TMPDIR}/mnist.onnx
+
+  # upload artifact with required annotations and version
+  run regctl artifact put --annotation description="used for demo purposes" --annotation model_format_name="onnx" --annotation model_format_name="onnx" --annotation  model_format_version="1" --artifact-type "application/vnd.model.type" localhost:${zot_port}/models/my-model-from-gh:v1 -f ${BATS_FILE_TMPDIR}/mnist.onnx
+
+  # list artifacts
+  run regctl artifact list localhost:${zot_port}/models/my-model-from-gh:v1 --format raw-body
+
+  # list artifacts of type
+  run regctl artifact list --filter-artifact-type "application/vnd.model.type" localhost:${zot_port}/models/my-model-from-gh:v1 --format raw-body
+
+  # get artifact
+  run regctl artifact get localhost:${zot_port}/models/my-model-from-gh:v1
+}