test: allow passing audio gcs uri env variable to Speech integration tests (#239)

Author: jameszhao00

google-cloud-speech/src/test/java/com/google/cloud/speech/v1/it/ITSpeechTest.java

@@ -148,6 +148,10 @@ private RecognitionConfig config() {
  }
 
  public RecognitionAudio audio() {
+ String audio_gcs_uri = System.getenv("AUDIO_GCS_URI");
+ if (audio_gcs_uri != null) {
+ return RecognitionAudio.newBuilder().setUri(audio_gcs_uri).build();
+ }
  return RecognitionAudio.newBuilder().setUri("gs://gapic-toolkit/hello.flac").build();
  }
 }