Recreate webhooks when they go missing, reuse older webhooks, and initiate connections to Redis cluster

src/cli.rs

@@ -212,6 +212,15 @@ pub enum Commands {
             default_value_t = Shard::default())
         ]
         shard: Shard,
+
+        /// The Redis URLs to connect to.
+        #[arg(
+            long,
+            env = "PAYPHONE_REDIS_URLS",
+            value_name = "URLS",
+            default_values = &["redis://127.0.0.1:6379"],
+        )]
+        redis_urls: Vec<String>,
     },
 
     /// Starts a documentation server for the project which serves `cargo doc` and refreshes on