fix(docz-core): pass down host when running serve (#1384)

Author: ShinyLeee

core/docz-core/src/commands/serve.ts

@@ -11,12 +11,19 @@ export const serve = async (args: Arguments<any>) => {
 
   if (config.port) {
     cliArgs.push('--')
-    // Append gatsby option `port`to CLI args
+    // Append gatsby option `port` to CLI args
     // https://www.gatsbyjs.org/docs/cheat-sheet/#cheat_sheet-text
     cliArgs.push('--port')
     cliArgs.push(String(config.port))
   }
 
+  if (config.host) {
+    // Append gatsby option `host` to CLI args
+    // https://www.gatsbyjs.org/docs/cheat-sheet/#cheat_sheet-text
+    cliArgs.push('--host')
+    cliArgs.push(String(config.host))
+  }
+
   sh.cd(paths.docz)
   spawnSync('npm', cliArgs)
 }