hotfix: add missing code checkout

Author: begonaalvarezd

.github/workflows/build-desktop.yml

@@ -236,6 +236,9 @@ jobs:
         steps:
             - run: echo ${{ github.ref }}
 
+            - name: Checkout code
+              uses: actions/checkout@v2
+
             - name: Downloading artifacts windows
               uses: actions/download-artifact@v2
               with: