fix: legacy docker config support (#803)

- oras-credential-go release note:
https://github.com/oras-project/oras-credentials-go/releases/tag/v0.3.1
- Resolves #801 

Signed-off-by: Junjie Gao <[email protected]>

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/notaryproject/notation-go v1.0.0
 	github.com/opencontainers/go-digest v1.0.0
 	github.com/opencontainers/image-spec v1.1.0-rc5
-	github.com/oras-project/oras-credentials-go v0.3.0
+	github.com/oras-project/oras-credentials-go v0.3.1
 	github.com/sirupsen/logrus v1.9.3
 	github.com/spf13/cobra v1.7.0
 	github.com/spf13/pflag v1.0.5

go.sum

@@ -24,8 +24,8 @@ github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8
 github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
 github.com/opencontainers/image-spec v1.1.0-rc5 h1:Ygwkfw9bpDvs+c9E34SdgGOj41dX/cbdlwvlWt0pnFI=
 github.com/opencontainers/image-spec v1.1.0-rc5/go.mod h1:X4pATf0uXsnn3g5aiGIsVnJBR4mxhKzfwmvK/B2NTm8=
-github.com/oras-project/oras-credentials-go v0.3.0 h1:Bg1d9iAmgo50RlaIy2XI5MQs7qL00DB3R9Q4JRP1VWs=
-github.com/oras-project/oras-credentials-go v0.3.0/go.mod h1:fFCebDQo0Do+gnM96uV9YUnRay0pwuRQupypvofsp4s=
+github.com/oras-project/oras-credentials-go v0.3.1 h1:sfGqZ8sjPifEaOtjHOQTPr8D+Tql4bpw58Dd9wjmm9w=
+github.com/oras-project/oras-credentials-go v0.3.1/go.mod h1:fFCebDQo0Do+gnM96uV9YUnRay0pwuRQupypvofsp4s=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=