[CI] Fix checkout action missing fetch depth

Need a fetch depth greater than 1 to find latest tag.

.github/workflows/cd.yml

@@ -38,6 +38,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           ref: ${{ github.event.inputs.ref }}
+          fetch-depth: 0
           path: deluge_src
 
       - name: Set up Python