Publish multi-version documentation site (#1727)

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: bb4b44f0-f505-49c5-9878-76e2b40c7a15
Copilot-Session: 8eac1204-10ae-4319-9333-aee5dd43dcc8

scripts/list-versions.mjs

@@ -0,0 +1,17 @@
+// Print the versions to build, one per line, as "<slug>\t<ref>".
+// Consumed by the multi-version docs workflow to drive its build loop.
+//
+// Usage: node scripts/list-versions.mjs [--versions <path>]
+
+import { readFile } from "node:fs/promises";
+import path from "node:path";
+import { manifestPath } from "./manifest-path.mjs";
+
+const arg = process.argv.slice(2);
+const i = arg.indexOf("--versions");
+const versionsPath = i !== -1 ? path.resolve(arg[i + 1]) : manifestPath;
+
+const manifest = JSON.parse(await readFile(versionsPath, "utf8"));
+for (const v of manifest.versions) {
+  process.stdout.write(`${v.slug}\t${v.ref}\n`);
+}