feat: make gdev parameters dynamic

node/src/chain_spec/gdev.rs

@@ -140,6 +140,7 @@ fn devnet_genesis(
                 .collect(),
         },
         strong_cert: StrongCertConfig {
+            apply_cert_period_at_genesis: false,
             certs_by_issuer: clique_wot(
                 initial_identities.len(),
                 gdev_runtime::parameters::ValidityPeriod::get(),