chore: Enable backend test in workflow

.github/workflows/automated-tests.yml

@@ -23,7 +23,7 @@ jobs:
                   ./musare.sh build
             - name: Start Musare
               run: ./musare.sh start
-#            - name: Test Backend
-#              run: ./musare.sh test backend
+            - name: Test Backend
+              run: ./musare.sh test backend
             - name: Test Frontend
               run: ./musare.sh test frontend