fix: Redis 6 on Heroku breaks ActionCable config (#4269)

Heroku made some SSL/TLS changes with Redis 6, which is breaking the ActionCable configuration.
Hence providing an environment variable configuration `REDIS_OPENSSL_VERIFY_MODE` to fix that.

set the value `none` for this environment variable in your Heroku installations where breakage occurs.

fixes: #2420

.env.example

@@ -32,6 +32,11 @@ REDIS_SENTINELS=
 # You can find list of master using "SENTINEL masters" command
 REDIS_SENTINEL_MASTER_NAME=
 
+# Redis premium breakage in heroku fix
+# enable the following configuration
+# ref: https://github.com/chatwoot/chatwoot/issues/2420
+# REDIS_OPENSSL_VERIFY_MODE=none
+
 # Postgres Database config variables
 POSTGRES_HOST=postgres
 POSTGRES_USERNAME=postgres