fix: Fixes sensor service test that was flaky and moves docker stuff into it's own directory.

Sources/SensorsService/SensorsService.swift

@@ -29,6 +29,9 @@ public actor SensorsService: Service {
   /// values to publish back to the MQTT broker.
   var sensors: [TemperatureAndHumiditySensor]
 
+  @_spi(Internal)
+  public var isListening: Bool = false
+
   var topics: [String] {
     sensors.reduce(into: [String]()) { array, sensor in
       array.append(sensor.topics.temperature)
@@ -65,13 +68,16 @@ public actor SensorsService: Service {
         switch event {
         case .shuttingDown:
           logger?.debug("Received shutdown event.")
+          isListening = false
           try await self.shutdown()
         case .disconnected:
           logger?.debug("Received disconnected event.")
+          isListening = false
           try await Task.sleep(for: .milliseconds(100))
         case .connected:
           logger?.debug("Received connected event.")
           let stream = try await makeStream()
+          isListening = true
           for await result in stream.cancelOnGracefulShutdown() {
             logger?.debug("Received result for topic: \(result.topic)")
             await self.handleResult(result)