Advertise --advertise-false-custody-group-count for testing PeerDAS (#7593)

#6973

beacon_node/lighthouse_network/src/config.rs

@@ -139,6 +139,9 @@ pub struct Config {
     /// Configuration for the minimum message size for which IDONTWANT messages are send in the mesh.
     /// Lower the value reduces the optimization effect of the IDONTWANT messages.
     pub idontwant_message_size_threshold: usize,
+
+    /// Flag for advertising a fake CGC to peers for testing ONLY.
+    pub advertise_false_custody_group_count: Option<u64>,
 }
 
 impl Config {
@@ -363,6 +366,7 @@ impl Default for Config {
             invalid_block_storage: None,
             inbound_rate_limiter_config: None,
             idontwant_message_size_threshold: DEFAULT_IDONTWANT_MESSAGE_SIZE_THRESHOLD,
+            advertise_false_custody_group_count: None,
         }
     }
 }