Fix checkout-pr by using fetch & checkout instead of pull

docker/dockerfile

@@ -44,8 +44,9 @@ RUN apt update \
 RUN rm -rf ./* && chown node /app
 
 USER node
-
+RUN git config --global user.email "no-reply@no-reply.com"
-RUN git clone --branch pr-test https://github.com/louislam/uptime-kuma.git .
+RUN git config --global user.name "PR Tester"
+RUN git clone https://github.com/louislam/uptime-kuma.git .
 RUN npm ci
 
 EXPOSE 3000 3001

extra/checkout-pr.js

@@ -22,7 +22,12 @@ let result = childProcess.spawnSync("git", [ "remote", "add", name, `https://git
 console.log(result.stdout.toString());
 console.error(result.stderr.toString());
 
-result = childProcess.spawnSync("git", [ "pull", name, branch ]);
+result = childProcess.spawnSync("git", [ "fetch", name, branch ]);
+
+console.log(result.stdout.toString());
+console.error(result.stderr.toString());
+
+result = childProcess.spawnSync("git", [ "checkout", branch, "--force" ]);
 
 console.log(result.stdout.toString());
 console.error(result.stderr.toString());