Add docker-compose option for BWE Estimator Engine. (#2129)

docker-compose.yml

@@ -20,6 +20,7 @@ services:
             - AUDIO_QUALITY_OPUS_BITRATE
             - AUTO_CAPTION_ON_RECORD
             - BRANDING_DATA_URL
+            - BWE_ESTIMATOR_ENGINE
             - BOSH_RELATIVE
             - CHROME_EXTENSION_BANNER_JSON
             - CODEC_ORDER_JVB

jvb/rootfs/defaults/jvb.conf

@@ -126,6 +126,14 @@ videobridge {
     {{ end -}}
 }
 
+jmt {
+    bwe {
+        estimator {
+            engine = "${{ .Env.BWE_ESTIMATOR_ENGINE | default "GoogleCc" }}"
+        }
+    }
+}
+
 ice4j {
     harvest {
         mapping {