Update backend.yml

Author: ppolariss

.github/workflows/backend.yml

@@ -9,11 +9,12 @@ env:
 jobs:
   docker:
     runs-on: ubuntu-latest
-    working-directory: ./backend
     steps:
       - name: Checkout
         uses: actions/checkout@master
 
+      - name: Change to backend directory
+        run: cd backend
 #      - name: Set up Go
 #        uses: actions/setup-go@master
 #        with: