Update wireguard-go.yml

.github/workflows/wireguard-go.yml

@@ -12,6 +12,7 @@ jobs:
 
     env:
       workdir: ./wireguard-go-source
+      version: 0.0.20201118
 
     steps:
       - name: Checkout code
@@ -21,7 +22,9 @@ jobs:
 
       - name: Git clone WireGuard-go
         run: |
-          git clone https://git.zx2c4.com/wireguard-go ${{ env.workdir }}
+          mkdir -p ${{ env.workdir }}
+          wget https://git.zx2c4.com/wireguard-go/snapshot/wireguard-go-${{ env.version }}.tar.xz
+          tar -xvf wireguard-go-${{ env.version }}.tar.xz -C ${{ env.workdir }}
           cp ./.github/wireguard-go-releaser.yml ${{ env.workdir }}/.goreleaser.yml
 
       - name: Set up GoReleaser