Chore: Use KVStore for the manifest public key (#66839)

pkg/server/backgroundsvcs/background_services.go

@@ -8,6 +8,7 @@ import (
 	uss "github.com/grafana/grafana/pkg/infra/usagestats/service"
 	"github.com/grafana/grafana/pkg/infra/usagestats/statscollector"
 	"github.com/grafana/grafana/pkg/plugins/manager/process"
+	"github.com/grafana/grafana/pkg/plugins/manager/signature"
 	"github.com/grafana/grafana/pkg/registry"
 	"github.com/grafana/grafana/pkg/services/alerting"
 	"github.com/grafana/grafana/pkg/services/auth"
@@ -50,6 +51,7 @@ func ProvideBackgroundServiceRegistry(
 	grpcServerProvider grpcserver.Provider, secretMigrationProvider secretsMigrations.SecretMigrationProvider, loginAttemptService *loginattemptimpl.Service,
 	bundleService *supportbundlesimpl.Service,
 	publicDashboardsMetric *publicdashboardsmetric.Service,
+	signature *signature.Signature,
 	// Need to make sure these are initialized, is there a better place to put them?
 	_ dashboardsnapshots.Service, _ *alerting.AlertNotificationService,
 	_ serviceaccounts.Service, _ *guardian.Provider,
@@ -86,6 +88,7 @@ func ProvideBackgroundServiceRegistry(
 		loginAttemptService,
 		bundleService,
 		publicDashboardsMetric,
+		signature,
 	)
 }