Improve the experience of testing pull requests (#5942)

extra/checkout-pr.mjs

@@ -0,0 +1,34 @@
+import childProcess from "child_process";
+import { parsePrName } from "./kuma-pr/pr-lib.mjs";
+
+let { name, branch } = parsePrName(process.env.UPTIME_KUMA_GH_REPO);
+
+console.log(`Checking out PR from ${name}:${branch}`);
+
+// Checkout the pr
+let result = childProcess.spawnSync("git", [ "remote", "add", name, `https://github.com/${name}/uptime-kuma` ], {
+    stdio: "inherit"
+});
+
+if (result.status !== 0) {
+    console.error("Failed to add remote repository.");
+    process.exit(1);
+}
+
+result = childProcess.spawnSync("git", [ "fetch", name, branch ], {
+    stdio: "inherit"
+});
+
+if (result.status !== 0) {
+    console.error("Failed to fetch the branch.");
+    process.exit(1);
+}
+
+result = childProcess.spawnSync("git", [ "checkout", `${name}/${branch}`, "--force" ], {
+    stdio: "inherit"
+});
+
+if (result.status !== 0) {
+    console.error("Failed to checkout the branch.");
+    process.exit(1);
+}