feat: copy default favicon if it doesn't exist

src/upgrades/1.17.0/default_favicon.js

@@ -0,0 +1,19 @@
+'use strict';
+
+const nconf = require('nconf');
+const path = require('path');
+const fs = require('fs');
+const file = require('../../file');
+
+module.exports = {
+	name: 'Store default favicon if it does not exist',
+	timestamp: Date.UTC(2021, 2, 9),
+	method: async function () {
+		const pathToIco = path.join(nconf.get('upload_path'), 'system', 'favicon.ico');
+		const defaultIco = path.join(nconf.get('base_dir'), 'public', 'favicon.ico');
+		const exists = await file.exists(pathToIco);
+		if (!exists) {
+			await fs.promises.copyFile(defaultIco, pathToIco);
+		}
+	},
+};