Added post install script

postinstall.js

@@ -0,0 +1,23 @@
+import { execSync } from 'child_process';
+import fs from 'fs';
+import path from 'path';
+
+const packageJsonPath = path.resolve('./package.json');
+const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
+
+const devDependencies = packageJson.devDependencies || {};
+let allDevDependenciesInstalled = true;
+
+for (const dep in devDependencies) {
+  try {
+    console.log(dep)
+    fs.statSync('node_modules/' + dep);
+  } catch (error) {
+    allDevDependenciesInstalled = false;
+    console.error(`DevDependency ${dep} is not installed.`);
+  }
+}
+
+if (allDevDependenciesInstalled) {
+  execSync('pnpm run build:etherpad', { stdio: 'inherit' });
+}