feat: an easy check for changed files

Author: AlaRduTP

.github/workflows/lab-autograding.yml

@@ -44,12 +44,10 @@ jobs:
 
                       const files = await github.rest.pulls.listFiles({ owner, repo, pull_number: issue_number });
                       const changedFiles = files.data.map((file) => file.filename);
-                      const allowedFiles = [
-                        `lab${labNumber}/main_test.js`,
-                      ];
-                      // if (!changedFiles.every((file) => allowedFiles.includes(file))) {
-                      //   core.setFailed('The PR contains changes to files other than the allowed files.');
-                      // }
+                      const allowedFileRegex = /^lab\d+\/main_test.js$/;
+                      if (!changedFiles.every((file) => allowedFileRegex.test(file))) {
+                        core.setFailed('The PR contains changes to files other than the allowed files.');
+                      }
                       return labNumber;
             - name: Grading
               run: |