chore: move the go code into a subfolder

apps/api/internal/net/start_port.go

@@ -0,0 +1,11 @@
+//go:build !integration
+
+package net
+
+import (
+	"net"
+)
+
+func ListenConfig() *net.ListenConfig {
+	return &net.ListenConfig{}
+}

apps/api/internal/net/start_port_integration.go

@@ -0,0 +1,25 @@
+//go:build integration
+
+package net
+
+import (
+	"net"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func ListenConfig() *net.ListenConfig {
+	return &net.ListenConfig{
+		Control: reusePort,
+	}
+}
+
+func reusePort(network, address string, conn syscall.RawConn) error {
+	return conn.Control(func(descriptor uintptr) {
+		err := syscall.SetsockoptInt(int(descriptor), syscall.SOL_SOCKET, unix.SO_REUSEPORT, 1)
+		if err != nil {
+			panic(err)
+		}
+	})
+}