fix exclude public argument to validate command

Author: louismariegaborit

bin/encore.js

@@ -30,9 +30,15 @@ if (runtimeConfig.outputJson) {
 process.argv.splice(2, 1);
 
 // remove arguments not supported by webpack/-dev-server
-const encoreOnlyArguments = new Set(['--keep-public-path', '--public']);
+const encoreOnlyArguments = new Set(['--keep-public-path']);
 process.argv = process.argv.filter(arg => !encoreOnlyArguments.has(arg));
 
+// remove argument --public not supported by webpack/dev-server
+const indexPublicArgument = process.argv.indexOf('--public');
+if (indexPublicArgument !== -1) {
+    process.argv.splice(indexPublicArgument, 2);
+}
+
 if (!runtimeConfig.isValidCommand) {
     if (runtimeConfig.command) {
         console.log(chalk.bgRed.white(`Invalid command "${runtimeConfig.command}"`));