Default to in-memory registry in single-binary mode

This avoids various issues of the old "mdns" default. At least for the simple
single process setup (#3134, #4597). When starting the services individually we
still default to "mdns".

ocis/pkg/command/server.go

@@ -4,6 +4,7 @@ import (
 	"github.com/owncloud/ocis/v2/ocis-pkg/config"
 	"github.com/owncloud/ocis/v2/ocis-pkg/config/configlog"
 	"github.com/owncloud/ocis/v2/ocis-pkg/config/parser"
+	"github.com/owncloud/ocis/v2/ocis-pkg/registry"
 	"github.com/owncloud/ocis/v2/ocis/pkg/register"
 	"github.com/owncloud/ocis/v2/ocis/pkg/runtime"
 	"github.com/urfave/cli/v2"
@@ -19,6 +20,8 @@ func Server(cfg *config.Config) *cli.Command {
 			return configlog.ReturnError(parser.ParseConfig(cfg, false))
 		},
 		Action: func(c *cli.Context) error {
+			// Prefer the in-memory registry as the default when running in single-binary mode
+			registry.Configure("memory")
 			r := runtime.New(cfg)
 			return r.Start()
 		},