Generate meta only if in dev

scripts/build.js

@@ -128,10 +128,12 @@ async function runBuild(entry, outfile) {
 
   await Promise.all([hbsFiles, mainBuild, oldClientVersions])
 
+  if (isDev) {
     fs.writeFileSync(
       `dist/${path.basename(outfile)}.meta.json`,
       JSON.stringify((await mainBuild).metafile)
     )
+  }
 
   console.log(
     "\x1b[32m%s\x1b[0m",