Change how secret is loaded on windows build workflow

Author: jmaralo

.github/workflows/build-backend.yaml

@@ -78,10 +78,10 @@ jobs:
     - name: "Load secret"
       working-directory: "${{env.BACKEND_DIR}}"
       run: |
-        echo "${{env.SECRET}}" > ".\internal\excel\secret.json"
-        echo "${{env.SECRET}}" > ".\internal\excel_adapter\internals\secret.json"
-        echo "${{env.SECRET}}" > ".\pkg\excel\secret.json"
-        echo "${{env.SECRET}}" > ".\pkg\excel_adapter\internals\secret.json"
+        echo "$env:SECRET" > ".\internal\excel\secret.json"
+        echo "$env:SECRET" > ".\internal\excel_adapter\internals\secret.json"
+        echo "$env:SECRET" > ".\pkg\excel\secret.json"
+        echo "$env:SECRET" > ".\pkg\excel_adapter\internals\secret.json"
 
     - name: "Create output path"
       working-directory: "${{env.BACKEND_DIR}}"