Move SCUM lifecycle ownership to plugin

platform/service/distribution_build_execution_test.go

@@ -1,6 +1,8 @@
 package service
 
 import (
+	"encoding/base64"
+	"encoding/json"
 	"errors"
 	"strings"
 	"sync"
@@ -31,6 +33,17 @@ func (builder captureDistributionBuilder) Build(input domain.DistributionBuildIn
 
 func TestCoreServiceKeepsPlatformBuildKeyOffMachineJobChannel(t *testing.T) {
 	svc, session, instance := newDistributionTestFixture(t)
+	plugin, err := svc.store.GamePlugins().Get(instance.PluginID)
+	if err != nil {
+		t.Fatalf("get plugin fixture: %v", err)
+	}
+	plugin.LifecycleAssets = []domain.PluginAssetFile{
+		{Path: "actions/install.json", Content: `{"version":1,"action":"install","mode":"oneshot"}`, Mode: 0o600},
+		{Path: "bin/install-server", Content: "#!/usr/bin/env sh\n", Mode: 0o700},
+	}
+	if err := svc.store.GamePlugins().Update(plugin); err != nil {
+		t.Fatalf("seed plugin lifecycle assets: %v", err)
+	}
 	inputs := make(chan domain.DistributionBuildInput, 1)
 	release := make(chan struct{})
 	var releaseOnce sync.Once
@@ -55,6 +68,17 @@ func TestCoreServiceKeepsPlatformBuildKeyOffMachineJobChannel(t *testing.T) {
 	if platformInput.AuthKey == "" || platformInput.JobID != distribution.BuildJobID || platformInput.RunEndpointID != instance.RunEndpointID {
 		t.Fatalf("platform builder received incomplete internal input: %+v", platformInput)
 	}
+	decodedSeed, err := base64.StdEncoding.DecodeString(platformInput.WorkspaceSeed)
+	if err != nil {
+		t.Fatalf("decode workspace seed: %v", err)
+	}
+	var seedFiles []domain.PluginAssetFile
+	if err := json.Unmarshal(decodedSeed, &seedFiles); err != nil {
+		t.Fatalf("unmarshal workspace seed: %v", err)
+	}
+	if platformInput.ProfileKey != "local" || len(seedFiles) != 2 || seedFiles[1].Path != "bin/install-server" || seedFiles[1].Content == "" {
+		t.Fatalf("platform builder received incomplete plugin workspace seed: profile=%q seed=%+v", platformInput.ProfileKey, seedFiles)
+	}
 	auth, err := svc.AuthenticateComponent(domain.ComponentAuthenticationRequest{
 		ServerInstanceID: instance.ID,
 		ComponentKind:    domain.DistributionComponentRun,