utils/compose: change service command to []string

e2e/forwarder/service.go

@@ -53,7 +53,7 @@ func HttpbinService() *Service {
 	return &Service{
 		Name:    HttpbinServiceName,
 		Image:   Image,
-		Command: "test httpbin",
+		Command: []string{"test", "httpbin"},
 		Environment: map[string]string{
 			"FORWARDER_API_ADDRESS": ":10000",
 		},
@@ -64,7 +64,7 @@ func GRPCTestService() *Service {
 	s := &Service{
 		Name:    GRPCTestServiceName,
 		Image:   Image,
-		Command: "test grpc",
+		Command: []string{"test", "grpc"},
 		Environment: map[string]string{
 			"FORWARDER_ADDRESS": ":1443",
 		},

e2e/run.go

@@ -7,7 +7,6 @@
 package main
 
 import (
-	"bytes"
 	"context"
 	"flag"
 	"fmt"
@@ -128,17 +127,19 @@ func testService(s *setup.Setup) *compose.Service {
 		run = s.Run
 	}
 
-	var cmd bytes.Buffer
+	var cmd []string
 	if *args.debug {
-		cmd.WriteString("-test.v ")
+		cmd = append(cmd, "-test.v")
 	}
-	fmt.Fprintf(&cmd, "-test.run %q -test.shuffle on -services %s",
-		run, strings.Join(maps.Keys(s.Compose.Services), ","))
+	cmd = append(cmd,
+		"-test.run", run,
+		"-test.shuffle", "on",
+		"-services", strings.Join(maps.Keys(s.Compose.Services), ","))
 
 	c := &compose.Service{
 		Name:    setup.TestServiceName,
 		Image:   "forwarder-e2e",
-		Command: cmd.String(),
+		Command: cmd,
 		Environment: map[string]string{
 			"GOMAXPROCS": "1",
 		},

utils/compose/service.go

@@ -18,7 +18,7 @@ type ServiceNetwork struct {
 type Service struct {
 	Name        string                    `yaml:"-"`
 	Image       string                    `yaml:"image,omitempty"`
-	Command     string                    `yaml:"command,omitempty"`
+	Command     []string                  `yaml:"command,omitempty"`
 	Environment map[string]string         `yaml:"environment,omitempty"`
 	Ports       []string                  `yaml:"ports,omitempty"`
 	Volumes     []string                  `yaml:"volumes,omitempty"`