Add image-upload CLI command

Author: bbiggerr

openapi.yaml

@@ -3917,7 +3917,15 @@ paths:
               }' \
               https://api.linode.com/v4/images/upload
       - lang: CLI
-        source: >
+        source: |
+          # Use the image-upload plugin to upload the Image file in a single step
+          linode-cli image-upload \
+            --description "Optional details about the Image" \
+            --label "Example Image" \
+            --region us-east \
+            /path/to/image-file.img.gz
+
+          # Returns an upload URL and requires uploading the Image file with a second step
           linode-cli images upload \
             --description "Optional details about the Image" \
             --label "Example Image" \