feat(cli,run): use 127.0.0.1 as default host value if empty

Makefile

@@ -15,8 +15,8 @@ SHELL := bash
 
 build: build-edge-cli build-client-sdk-test-app
 
-watch:
-	go run -mod=readonly github.com/cortesi/modd/cmd/modd@latest
+watch: tools/modd/bin/modd
+	tools/modd/bin/modd
 
 .PHONY: test
 test: test-go
@@ -102,3 +102,7 @@ tools/yq/bin/yq:
 	mkdir -p tools/yq/bin
 	curl -L --output tools/yq/bin/yq https://github.com/mikefarah/yq/releases/download/v4.31.1/yq_linux_amd64
 	chmod +x tools/yq/bin/yq
+
+tools/modd/bin/modd:
+	mkdir -p tools/modd/bin
+	GOBIN=$(PWD)/tools/modd/bin go install -mod=readonly github.com/cortesi/modd/cmd/modd@latest

cmd/cli/command/app/run.go

@@ -367,7 +367,11 @@ func findMatchingDeviceAddress(ctx context.Context, from string, defaultAddr str
 				continue
 			}
 
-			return ip.String(), nil
+			if ip.To4() == nil {
+				continue
+			}
+
+			return ip.To4().String(), nil
 		}
 	}
 
@@ -375,6 +379,10 @@ func findMatchingDeviceAddress(ctx context.Context, from string, defaultAddr str
 }
 
 func newAppRepository(host string, basePort uint64, manifests ...*app.Manifest) *appModuleMemory.Repository {
+	if host == "" {
+		host = "127.0.0.1"
+	}
+
 	return appModuleMemory.NewRepository(
 		func(ctx context.Context, id app.ID, from string) (string, error) {
 			appIndex := 0