Update backend.yml

Author: ppolariss

.github/workflows/backend.yml

@@ -9,12 +9,13 @@ env:
 jobs:
   docker:
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        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: