update to chronus' prepare auto release code (#2559)

eng/prepare-release-branch.js

@@ -0,0 +1,47 @@
+const stdout = execSync(`git status --porcelain`).toString();
+
+if (stdout.trim() !== "") {
+  console.log("Commiting the following changes:\n", stdout);
+
+  execSync(`git add -A`);
+  execSync(`git -c [email protected] -c user.name="Auto Chronus Bot" commit -am "Bump versions"`);
+  execSync(`git push origin HEAD:${branchName} --force`);
+
+  console.log();
+  console.log("-".repeat(160));
+  console.log("|  Link to create the PR");
+  console.log(`|  https://github.com/timotheeguerin/chronus/pull/new/${branchName}  `);
+  console.log("-".repeat(160));
+
+  const github = getOctokit(process.env.GITHUB_TOKEN ?? "");
+  const prs = await github.rest.pulls.list({
+    ...context.repo,
+    head: `${context.repo.owner}:${branchName}`,
+    base: "main",
+    state: "open",
+  });
+  console.log(
+    "Found those prs",
+    prs.url,
+    prs.data.map((x) => x.head.ref),
+  );
+  const existing = prs.data[0];
+  if (existing) {
+    console.log("Existing, updating pr", existing.number);
+    await github.rest.pulls.update({
+      ...context.repo,
+      pull_number: existing.number,
+      body: changeStatus,
+    });
+  } else {
+    await github.rest.pulls.create({
+      ...context.repo,
+      title: "Release changes",
+      head: branchName,
+      base: "main",
+      body: changeStatus,
+    });
+  }
+} else {
+  console.log("No changes to publish");
+}