CLI option to enable authoring when offline (#2104)

* CLI option to enable authoring when offline

* Update core/service/src/config.rs

Co-Authored-By: arkpar <arkady.paronyan@gmail.com>

substrate/core/service/src/config.rs

@@ -68,6 +68,8 @@ pub struct Configuration<C, G: Serialize + DeserializeOwned + BuildStorage> {
 	pub telemetry_endpoints: Option<TelemetryEndpoints>,
 	/// The default number of 64KB pages to allocate for Wasm execution
 	pub default_heap_pages: Option<u64>,
+	/// Enable authoring even when offline.
+	pub force_authoring: bool,
 }
 
 impl<C: Default, G: Serialize + DeserializeOwned + BuildStorage> Configuration<C, G> {
@@ -93,6 +95,7 @@ impl<C: Default, G: Serialize + DeserializeOwned + BuildStorage> Configuration<C
 			rpc_ws: None,
 			telemetry_endpoints: None,
 			default_heap_pages: None,
+			force_authoring: false,
 		};
 		configuration.network.boot_nodes = configuration.chain_spec.boot_nodes().to_vec();