feat(launcher): bundle Bun and use it across all launchers (#243)

scripts/build-launcher.ts

@@ -0,0 +1,54 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { execFileSync } from 'node:child_process';
+import packageJson from '../package.json';
+import { posixLauncherBootstrapContent } from '../src/main/runtime/posix-launcher-bootstrap';
+import { windowsLauncherBootstrapContent } from '../src/main/runtime/windows-launcher-bootstrap';
+
+const outputDirectory = path.join(process.cwd(), 'dist', 'launcher');
+
+function bundle(options: {
+  entrypoint: string;
+  outfile: string;
+  target: 'bun' | 'node';
+  format?: 'cjs';
+  banner?: string;
+}): void {
+  const args = [
+    'build',
+    options.entrypoint,
+    `--outfile=${options.outfile}`,
+    `--target=${options.target}`,
+    '--packages=bundle',
+  ];
+  if (options.format) args.push(`--format=${options.format}`);
+  if (options.banner) args.push(`--banner=${options.banner}`);
+  execFileSync(process.execPath, args, { stdio: 'inherit' });
+}
+
+fs.mkdirSync(outputDirectory, { recursive: true });
+
+bundle({
+  entrypoint: path.join(process.cwd(), 'launcher', 'main.ts'),
+  outfile: path.join(outputDirectory, 'subminer.js'),
+  target: 'bun',
+  banner: '#!/usr/bin/env bun',
+});
+bundle({
+  entrypoint: path.join(process.cwd(), 'src', 'main', 'runtime', 'prepare-launcher-runtime.ts'),
+  outfile: path.join(outputDirectory, 'prepare.cjs'),
+  target: 'node',
+  format: 'cjs',
+});
+
+const posixLauncherPath = path.join(outputDirectory, 'subminer');
+fs.writeFileSync(posixLauncherPath, posixLauncherBootstrapContent(), { mode: 0o755 });
+fs.chmodSync(posixLauncherPath, 0o755);
+fs.writeFileSync(
+  path.join(outputDirectory, 'subminer.cmd'),
+  windowsLauncherBootstrapContent(),
+  'utf8',
+);
+fs.writeFileSync(path.join(outputDirectory, 'version'), `${packageJson.version}\n`, 'utf8');
+
+console.log(`Built launcher runtime artifacts in ${outputDirectory}`);