chore: don't fail the build when building from source tarball (#40)

support/command.ts

@@ -0,0 +1,17 @@
+import cp from 'node:child_process';
+import path from 'node:path';
+import url from 'node:url';
+
+const projectRoot = url.fileURLToPath(new URL('../', import.meta.url));
+
+export function command(cmd: string, dir = '') {
+  return cp.execSync(cmd, { cwd: path.join(projectRoot, dir), encoding: 'utf-8' }).trim();
+}
+
+export function tryCommand(cmd: string, dir = '', fallback = '') {
+  try {
+    return command(cmd, dir);
+  } catch (e) {
+    return fallback;
+  }
+}