add create options

runtime/options.go

@@ -0,0 +1,27 @@
+package runtime
+
+type CreateOption func(o *CreateOptions)
+
+type CreateOptions struct {
+	// command to execute including args
+	Command []string
+	// Environment to configure
+	Env []string
+}
+
+// Command specifies the command to execute
+func WithCommand(c string, args ...string) CreateOption {
+	return func(o *CreateOptions) {
+		// set command
+		o.Command = []string{c}
+		// set args
+		o.Command = append(o.Command, args...)
+	}
+}
+
+// Env sets the created service env
+func WithEnv(env []string) CreateOption {
+	return func(o *CreateOptions) {
+		o.Env = env
+	}
+}