fix typo

.github/workflows/build.yaml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout
         run: |
           git init
-          git remote add origin ${{ github.server_url }}:${{ github.repository }}.git
+          git remote add origin ${{ github.server_url }}/${{ github.repository }}.git
           git fetch --depth 1 origin ${{ github.ref }}
           git checkout FETCH_HEAD
           git lfs pull