Use go-containerregistry to push and pull

oci/go.mod

@@ -3,41 +3,25 @@ module github.com/tektoncd/experimental/oci
 go 1.13
 
 require (
-	github.com/containerd/cgroups v0.0.0-20200204152634-780d21166089 // indirect
-	github.com/containerd/containerd v1.3.3
-	github.com/containers/buildah v1.13.2 // indirect
-	github.com/containers/common v0.1.4 // indirect
-	github.com/containers/image/v5 v5.2.1 // indirect
-	github.com/containers/ocicrypt v0.0.0-20200206222626-3c3f2f1f1820 // indirect
-	github.com/deislabs/oras v0.8.1
-	github.com/fsouza/go-dockerclient v1.6.1 // indirect
+	github.com/docker/cli v0.0.0-20200130152716-5d0cf8839492 // indirect
+	github.com/docker/docker v1.4.2-0.20200203170920-46ec8731fbce // indirect
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
 	github.com/google/go-containerregistry v0.0.0-20200115214256-379933c9c22b
 	github.com/google/gofuzz v1.1.0 // indirect
-	github.com/ishidawataru/sctp v0.0.0-20191218070446-00ab2ac2db07 // indirect
-	github.com/mattn/go-shellwords v1.0.10 // indirect
-	github.com/opencontainers/image-spec v1.0.2-0.20190823105129-775207bd45b6
+	github.com/onsi/ginkgo v1.11.0 // indirect
+	github.com/onsi/gomega v1.8.1 // indirect
 	github.com/pkg/errors v0.9.1
-	github.com/pquerna/ffjson v0.0.0-20190930134022-aa0246cd15f7 // indirect
 	github.com/prometheus/client_golang v1.4.0 // indirect
-	github.com/seccomp/containers-golang v0.3.2 // indirect
-	github.com/sirupsen/logrus v1.4.2
 	github.com/spf13/cobra v0.0.5
-	github.com/spf13/viper v1.6.2 // indirect
 	github.com/tektoncd/pipeline v0.10.1
-	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
-	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
 	go.opencensus.io v0.22.3 // indirect
 	golang.org/x/crypto v0.0.0-20200206161412-a0c6ece9d31a // indirect
 	golang.org/x/net v0.0.0-20200202094626-16171245cfb2 // indirect
 	golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5 // indirect
 	google.golang.org/genproto v0.0.0-20200205142000-a86caf926a67 // indirect
 	google.golang.org/grpc v1.27.1 // indirect
-	gopkg.in/square/go-jose.v2 v2.4.1 // indirect
-	gopkg.in/yaml.v1 v1.0.0-20140924161607-9f9df34309c0
 	gopkg.in/yaml.v2 v2.2.8
 	k8s.io/api v0.17.2 // indirect
 	k8s.io/apimachinery v0.17.2
 	k8s.io/client-go v0.17.0
-	rsc.io/letsencrypt v0.0.3 // indirect
 )