All: Use Lerna to manage monorepo

packages/app-desktop/generateSha512.js

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+const fs = require('fs');
+const path = require('path');
+const os = require('os');
+const sha512 = require('js-sha512');
+
+const generateChecksumFile = () => {
+	if (os.platform() != 'linux') {
+		return []; // SHA-512 is only for AppImage
+	}
+	const distDirName = 'dist';
+	const distPath = path.join(__dirname, distDirName);
+	let appImageName = '';
+	const files = fs.readdirSync(distPath);
+	for (const key in files) {
+		const filename = files[key];
+		if (filename.includes('AppImage')) {
+			appImageName = filename;
+			break;
+		}
+	}
+	if (appImageName == '') {
+		throw 'AppImage not found!';
+	}
+	const appImagePath = path.join(distPath, appImageName);
+	const appImageContent = fs.readFileSync(appImagePath);
+	const checksum = sha512.sha512(appImageContent);
+	const sha512FileName = `${appImageName}.sha512`;
+	const sha512FilePath = path.join(distPath, sha512FileName);
+	fs.writeFileSync(sha512FilePath, checksum);
+	return [sha512FilePath];
+};
+
+exports.default = generateChecksumFile;