chore(v2): Fix Crowdin 409 issues in CI (#4739)

website/waitForCrowdin.js

@@ -0,0 +1,65 @@
+const {Translations} = require('@crowdin/crowdin-api-client');
+
+/*
+Crowdin does not support concurrent "project builds" (downloads of translations).
+The Crowdin CLI fails with error 409, and it leads to failures on Netlify.
+
+On Docusaurus, when we commit on master, we have 2 Netlify deployments triggered:
+- prod
+- i18n-staging (work-in-progress locales)
+
+This script helps the 2 deployments to not download translations concurrently from Crowdin.
+ */
+
+const pollInterval = 5000;
+const timeout = 5 * 60 * 1000;
+
+const projectId = 428890;
+const token = process.env.CROWDIN_PERSONAL_TOKEN; // set on Netlify
+
+const translations = new Translations({
+  token,
+});
+
+async function delay(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+async function hasBuildInProgress() {
+  const projectBuilds = await translations.listProjectBuilds(projectId);
+  return projectBuilds.data.some(
+    (build) => build.data.status === 'in-progress',
+  );
+}
+
+async function run() {
+  const timeBefore = Date.now();
+  while (true) {
+    if (Date.now() - timeBefore > timeout) {
+      console.warn(
+        '[Crowdin] Timeout of wait script reached => will try to proceed but download translations is likely to fail...',
+      );
+      break;
+    }
+
+    const inProgress = await hasBuildInProgress();
+    if (inProgress) {
+      console.log('[Crowdin] A build is still in progress => waiting...');
+      await delay(pollInterval);
+    } else {
+      console.warn('[Crowdin] No build in progress => lets continue');
+      break;
+    }
+  }
+}
+
+run().then(
+  () => {
+    process.exit(0);
+  },
+  (e) => {
+    console.error(e.message);
+    console.error(e.stack);
+    process.exit(1);
+  },
+);