[bbb-greenlight: 12/39] Set default cable adapter to postgres (#2096)

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit f992f76ae195788039b7b73ac66c6e9e3a6dd136
Author: Ahmad Farhat <ahmad af farhat gmail com>
Date:   Thu Sep 17 15:02:54 2020 -0400

    Set default cable adapter to postgres (#2096)

 sample.env | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/sample.env b/sample.env
index 0a0c50e..4a7d74b 100644
--- a/sample.env
+++ b/sample.env
@@ -252,6 +252,9 @@ DB_NAME=greenlight_production
 DB_USERNAME=postgres
 DB_PASSWORD=password
 
+# Use postgresql to handle ActionCable connections by default
+CABLE_ADAPTER=postgresql
+
 # Specify the default registration to be used by Greenlight until an administrator sets the
 # registration method
 # Allowed values are: