zot: crane cp fails

Describe the bug I tried to upload using crane and it failed.

bin/zot-darwin-arm64 serve examples/config-minimal.json

{"level":"info","module":"http","clientIP":"127.0.0.1:54199","method":"HEAD","path":"/v2/busybox/blobs/sha256:62aedd01bd8520c43d06b09f7a0f67ba9720bdc04631a8242c65ea995f3ecac8","statusCode":200,"latency":"498.167µs","bodySize":0,"headers":{"User-Agent":["crane/0.10.0 go-containerregistry/(devel)"]},"goroutine":82,"caller":"zotregistry.io/zot/pkg/api/session.go:132","time":"2022-07-13T10:57:01.683065-07:00","message":"HTTP API"}
{"level":"info","module":"http","clientIP":"127.0.0.1:54199","method":"PUT","path":"/v2/busybox/manifests/sha256:dcdf379c574e1773d703f0c0d56d67594e7a91d6b84d11ff46799f60fb081c52","statusCode":415,"latency":"6.292µs","bodySize":0,"headers":{"Accept-Encoding":["gzip"],"Content-Length":["527"],"Content-Type":["application/vnd.docker.distribution.manifest.v2+json"],"User-Agent":["crane/0.10.0 go-containerregistry/(devel)"]},"goroutine":82,"caller":"zotregistry.io/zot/pkg/api/session.go:132","time":"2022-07-13T10:57:01.683779-07:00","message":"HTTP API"}

> crane cp busybox localhost:8080/busybox:latest

2022/07/13 10:57:00 Copying from busybox to localhost:8080/busybox:latest
2022/07/13 10:57:01 existing blob: sha256:19d511225f94f9b5cbf3836eb02b5273c01b95da50735742560e3e45b8c8bfcc
2022/07/13 10:57:01 existing blob: sha256:62aedd01bd8520c43d06b09f7a0f67ba9720bdc04631a8242c65ea995f3ecac8
Error: failed to copy index: PUT http://localhost:8080/v2/busybox/manifests/sha256:dcdf379c574e1773d703f0c0d56d67594e7a91d6b84d11ff46799f60fb081c52: unexpected status code 415 Unsupported Media Type

To Reproduce Steps to reproduce the behavior:

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