Ancillary fixups

Change-type: patch
Signed-off-by: Ken Bannister <kb2ma@runbox.com>

Author: kb2ma

balena.yml

@@ -2,7 +2,7 @@ name: cloud-relay
 type: sw.block
 description: >-
   Push data to a cloud provider's IoT facility via MQTT messages.
-  Works with AWS, Azure, and Google Cloud.
+  Works with AWS, Azure, and Google Cloud including ClearBlade.
 assets:
   repository:
     type: blob.asset
@@ -14,9 +14,6 @@ assets:
       url: >-
         https://raw.githubusercontent.com/balena-io-examples/cloud-relay/master/logo.png
 data:
-  applicationEnvironmentVariables:
-    - SOUND_VOLUME: 75
-    - AUDIO_OUTPUT: AUTO
   defaultDeviceType: raspberrypi4-64
   supportedDeviceTypes:
     - raspberrypi4-64