fix(ci): defer proposals for merged release commits

scripts/lib/release-pull-request.mjs

@@ -0,0 +1,60 @@
+import { z } from "zod";
+
+const sha = z.string().regex(/^[a-f0-9]{40}$/u);
+const repository = z.string().regex(/^[\w.-]+\/[\w.-]+$/u);
+const pullRequest = z.object({
+  number: z.number().int().positive(),
+  body: z.string().nullable(),
+  merged_at: z.string().nullable(),
+  merge_commit_sha: sha.nullable(),
+  base: z.object({ ref: z.string() }),
+  head: z.object({
+    ref: z.string(),
+    repo: z.object({ full_name: z.string() }).nullable(),
+  }),
+  labels: z.array(z.object({ name: z.string() })),
+});
+
+/** Own REST release-PR identity for proposal admission and publication checks. */
+export async function readMergedReleasePullRequest(run, options) {
+  const repo = repository.parse(options.repository);
+  const source = sha.parse(options.source);
+  let candidates;
+  if (options.pr !== undefined) {
+    const number = z.coerce.number().int().positive().parse(options.pr);
+    candidates = [
+      pullRequest.parse(
+        JSON.parse(await run("gh", ["api", `repos/${repo}/pulls/${number}`])),
+      ),
+    ];
+  } else {
+    candidates = z
+      .array(z.array(pullRequest))
+      .parse(
+        JSON.parse(
+          await run("gh", [
+            "api",
+            "--paginate",
+            "--slurp",
+            `repos/${repo}/commits/${source}/pulls?per_page=100`,
+          ]),
+        ),
+      )
+      .flat();
+  }
+  const matching = candidates.filter(
+    (pr) =>
+      pr.merged_at !== null &&
+      pr.merge_commit_sha === source &&
+      pr.head.repo?.full_name.toLowerCase() === repo.toLowerCase() &&
+      pr.head.ref.startsWith("release-please--branches--") &&
+      (options.targetBranch === undefined ||
+        (pr.base.ref === options.targetBranch &&
+          pr.head.ref.startsWith(
+            `release-please--branches--${options.targetBranch}--`,
+          ))),
+  );
+  if (matching.length > 1)
+    throw new Error("Multiple merged Release Please PRs match the source");
+  return matching[0];
+}