"prefix" option for AWS

docs/configuration.md

@@ -170,6 +170,7 @@ The AWS Account ID and Region is primarily used to construct the ECR domain `[AC
       aws:
         accountId: 123456789
         region: ap-southeast-2
+        prefix: /cache
     ```
 
 #### ECR Options

pkg/config/config.go

@@ -70,6 +70,7 @@ type AWS struct {
 	AccountID  string     `yaml:"accountId"`
 	Region     string     `yaml:"region"`
 	Role       string     `yaml:"role"`
+	Prefix     string     `yaml:"prefix"`
 	ECROptions ECROptions `yaml:"ecrOptions"`
 }
 
@@ -107,7 +108,7 @@ func (a *AWS) EcrDomain() string {
 	if strings.HasPrefix(a.Region, "cn-") {
 		domain = "amazonaws.com.cn"
 	}
-	return fmt.Sprintf("%s.dkr.ecr.%s.%s", a.AccountID, a.Region, domain)
+	return fmt.Sprintf("%s.dkr.ecr.%s.%s%s", a.AccountID, a.Region, domain, a.Prefix)
 }
 
 func (g *GCP) GarDomain() string {

pkg/config/config_test.go

@@ -264,6 +264,20 @@ func TestEcrDomain(t *testing.T) {
 			},
 			domain: "123456789.dkr.ecr.cn-north-1.amazonaws.com.cn",
 		},
+		{
+			name: "aws with prefix",
+			cfg: Config{
+				Target: Registry{
+					Type: "aws",
+					AWS: AWS{
+						AccountID: "123456789",
+						Region:    "ap-southeast-2",
+						Prefix:    "/prefix",
+					},
+				},
+			},
+			domain: "123456789.dkr.ecr.ap-southeast-2.amazonaws.com/prefix",
+		},
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {