feat(registry) EE-806 add support for AWS ECR (#6165)

* feat(ecr) EE-806 add support for aws ecr

* feat(ecr) EE-806 fix wrong doc for Ecr Region

Co-authored-by: Simon Meng <simon.meng@portainer.io>

api/aws/ecr/authorization_token.go

@@ -0,0 +1,61 @@
+package ecr
+
+import (
+	"context"
+	"encoding/base64"
+	"fmt"
+	"strings"
+	"time"
+)
+
+func (s *Service) GetEncodedAuthorizationToken() (token *string, expiry *time.Time, err error) {
+	getAuthorizationTokenOutput, err := s.client.GetAuthorizationToken(context.TODO(), nil)
+	if err != nil {
+		return
+	}
+
+	if len(getAuthorizationTokenOutput.AuthorizationData) == 0 {
+		err = fmt.Errorf("AuthorizationData is empty")
+		return
+	}
+
+	authData := getAuthorizationTokenOutput.AuthorizationData[0]
+
+	token = authData.AuthorizationToken
+	expiry = authData.ExpiresAt
+
+	return
+}
+
+func (s *Service) GetAuthorizationToken() (token *string, expiry *time.Time, err error) {
+	tokenEncodedStr, expiry, err := s.GetEncodedAuthorizationToken()
+	if err != nil {
+		return
+	}
+
+	tokenByte, err := base64.StdEncoding.DecodeString(*tokenEncodedStr)
+	if err != nil {
+		return
+	}
+	tokenStr := string(tokenByte)
+	token = &tokenStr
+
+	return
+}
+
+func (s *Service) ParseAuthorizationToken(token string) (username string, password string, err error) {
+	if len(token) == 0 {
+		return
+	}
+
+	splitToken := strings.Split(token, ":")
+	if len(splitToken) < 2 {
+		err = fmt.Errorf("invalid ECR authorization token")
+		return
+	}
+
+	username = splitToken[0]
+	password = splitToken[1]
+
+	return
+}