switch to gopkg.in/yaml.v3

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/stack/config.go

@@ -1,6 +1,7 @@
 package stack
 
 import (
+	"bytes"
 	"fmt"
 
 	"github.com/docker/cli/cli"
@@ -11,7 +12,7 @@ import (
 	composeLoader "github.com/docker/cli/cli/compose/loader"
 	composetypes "github.com/docker/cli/cli/compose/types"
 	"github.com/spf13/cobra"
-	yaml "gopkg.in/yaml.v2"
+	"gopkg.in/yaml.v3"
 )
 
 func newConfigCommand(dockerCli command.Cli) *cobra.Command {
@@ -54,9 +55,12 @@ func outputConfig(configFiles composetypes.ConfigDetails, skipInterpolation bool
 		return "", err
 	}
 
-	d, err := yaml.Marshal(&config)
+	var buf bytes.Buffer
+	enc := yaml.NewEncoder(&buf)
+	enc.SetIndent(2)
+	err = enc.Encode(&config)
 	if err != nil {
 		return "", err
 	}
-	return string(d), nil
+	return buf.String(), nil
 }

cli/command/stack/config_test.go

@@ -45,8 +45,8 @@ services:
 services:
   foo:
     command:
-    - cat
-    - file2.txt
+      - cat
+      - file2.txt
     image: busybox:1.0
 `,
 		},
@@ -69,8 +69,8 @@ services:
 services:
   foo:
     command:
-    - cat
-    - file2.txt
+      - cat
+      - file2.txt
     image: busybox:${VERSION}
 `,
 		},