unsupported media type application/vnd.dev.cosign.simplesigning.v1+json

[spawar-apex]

Question
I'm using github action to automatically build docker image, sign it using cosign and push image to Google Artifact Registry".

But, when I tried to pull the image from GCP, it is throwing me with the following error:

<region>-docker.pkg.dev/sandbox/techdayscontainers/supply-chain-tech-days-2023@<sha>: Pulling from sandbox/techdayscontainers/supply-chain-tech-days-2023 unsupported media type application/vnd.dev.cosign.simplesigning.v1+json

Docker image manifests has layers property which has this media type of vnd.dev.cosign.

I didn't find any documentation about this. I came across OCI COntent Descriptors github documentation and they have mentioned about supported MediaType but no where I'm able to troubleshoot about unsupported media type.

Please share some thoughts around it.