ci: fix makemigrations echo during pr checks + build

Author: NGPixel

.github/workflows/build.yml

@@ -130,7 +130,8 @@ jobs:
         ./ietf/manage.py check
         echo "Validating migrations..."
         if ! (ietf/manage.py makemigrations 2>&1 | grep -q "^No changes detected$") ; then
-            echo -e "\nModel changes without migrations found." ; exit 1
+          echo "Model changes without migrations found."
+          exit 1
         fi
         echo "Running tests..."
         ./ietf/manage.py test --settings=settings_sqlitetest

.github/workflows/ci-run-tests.yml

@@ -42,7 +42,8 @@ jobs:
         ./ietf/manage.py check
         echo "Validating migrations..."
         if ! (ietf/manage.py makemigrations 2>&1 | grep -q "^No changes detected$") ; then
-            echo -e "\nModel changes without migrations found." ; exit 1
+          echo "Model changes without migrations found."
+          exit 1
         fi
         echo "Running tests..."
         ./ietf/manage.py test --settings=settings_sqlitetest