feat(init): add entries to .gitignore

packages/init/src/main.ts

@@ -9,13 +9,14 @@ export async function main(args: IInitArgs): Promise<void> {
     // issue: https://github.com/microsoft/TypeScript/issues/43329
     const ora = await (eval('import("ora")') as Promise<typeof import('ora')>);
     const chalk = (await (eval('import("chalk")') as Promise<typeof import('chalk')>)).default;
-    
+
     const spinner = ora.default('Installing lerna-dockerize').start();
     try {
         await installLernaDockerize(args);
         await addTemplates(args);
         await addConfig(args);
         await addScripts(args);
+        await addToGitIgnore(args);
         spinner.succeed('lerna-dockerize was successfully installed!');
         console.log(`\nnow try to run:`);
         console.log(`\t${chalk.yellow('>')} ${chalk.underline.blue(`npm run lerna-dockerize`)}`);
@@ -100,3 +101,18 @@ async function addScripts(args: IInitArgs): Promise<void> {
     const indentation = detectIdent(packageJson);
     await fsPromises.writeFile(packageJsonPath, JSON.stringify(packageJsonObject, undefined, indentation));
 }
+
+async function addToGitIgnore(args: IInitArgs): Promise<void> {
+    const gitIgnorePath = joinPath(args.workingDirectory ?? process.cwd(), '.gitignore');
+    let gitignore = '';
+    if (existsSync(gitIgnorePath)) {
+        gitignore = await fsPromises.readFile(gitIgnorePath, 'utf8');
+    }
+    gitignore += '\n\n';
+    gitignore += [
+        '# lerna-dockerize',
+        '# generated by lerna-dockerize',
+        'package-slim.json',
+        'Dockerfile',
+    ].join('\n');
+}