outpost: separate ak-api and proxy further for future outposts

outpost/pkg/ak/api_ws_msg.go

@@ -0,0 +1,17 @@
+package ak
+
+type websocketInstruction int
+
+const (
+	// WebsocketInstructionAck Code used to acknowledge a previous message
+	WebsocketInstructionAck websocketInstruction = 0
+	// WebsocketInstructionHello Code used to send a healthcheck keepalive
+	WebsocketInstructionHello websocketInstruction = 1
+	// WebsocketInstructionTriggerUpdate Code received to trigger a config update
+	WebsocketInstructionTriggerUpdate websocketInstruction = 2
+)
+
+type websocketMessage struct {
+	Instruction websocketInstruction   `json:"instruction"`
+	Args        map[string]interface{} `json:"args"`
+}