Container Support

This leads to pulp3 to pulp2 sync failure. In the converted manifest an empty blob with digest sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4 is present and pulp2 trys to fetch it unsuccessfully because pulp3 does not have it on the fs

Error: DKR1020: Image download(s) from https://kangae.example.com/v2/test_organizationupgrade1-test_product-foremanbusybox/blobs/sha256:a3ed95caeb02ffe68cdd9
fd84406680ae93d633cb16422d00e8a7c22955b46d4 failed. Sync task has failed to prevent a corrupted repository.
DKR1020: Image download(s) from https://kangae.example.com/v2/test_organizationupgrade1-library-composite-test_product-foremanbusybox/blobs/sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4 failed. Sync task has failed to prevent a corrupted repository.
DKR1020: Image download(s) from https://kangae.example.com/v2/test_organizationupgrade1-library-component_1-test_product-foremanbusybox/blobs/sha256:a3ed95ca
eb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4 failed. Sync task has failed to prevent a corrupted repository.


when i try to curl one of these, i get:

{"errors":[{"code":"BLOB_UNKNOWN","message":"Blob not found.","detail":{"digest":"sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4"}}]}

and on the pulp2 box: Apr 27 00:22:33  pulp: nectar.downloaders.threaded:INFO: Download failed: Download of https://kangae.example.com/v2/test_org
anizationupgrade1-library-composite-test_product-foremanbusybox/blobs/sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4 failed with code 404: Not Found

https://github.com/pulp/pulp_container/blob/master/pulp_container/app/schema_convert.py#L173

use this details to sync a repo

            "upstream_name": "foreman/busybox-test",                                                                                                                                                                                  
            "url": "https://quay.io/",