Give test_runner.sh execution permissions

Author: kbuffardi

.github/workflows/ci.yml

@@ -12,4 +12,6 @@ jobs:
       - name: Pull C++ container
         run: docker pull kbuffardi/cpp-container:latest
       - name: Test in container
-        run: docker run --platform linux/arm64 -v $(pwd):/usr/src -t kbuffardi/cpp-container
+        run: |
+          chmod +x test_runner.sh
+          docker run --platform linux/arm64 -v $(pwd):/usr/src -t kbuffardi/cpp-container