build: remove unusable flags

.github/workflows/lo-test.yml

@@ -38,7 +38,7 @@ jobs:
       - name: Checkout
         run: |
           cd
-          sudo curl -sL https://raw.githubusercontent.com/klever1988/nanopi-openwrt/zstd-bin/zstd | sudo tee /usr/bin/zstd > /dev/null
+          curl -sL https://raw.githubusercontent.com/klever1988/nanopi-openwrt/zstd-bin/zstd | sudo tee /usr/bin/zstd > /dev/null
           for i in {1..10}
           do
             curl -sL --fail https://github.com/klever1988/sshactions/releases/download/cache/lede.$DEVICE.img.zst.0$i || break
@@ -51,7 +51,7 @@ jobs:
           git remote set-branches --add origin openwrt-18.06
           git fetch && git reset --hard origin/openwrt-18.06-k5.4 && git merge -X theirs --no-edit origin/openwrt-18.06
           else
-          sudo chown $USER:$(id -gn) lede && (cd lede && git init && git remote add -t openwrt-18.06-k5.4 -f origin https://github.com/immortalwrt/immortalwrt && git checkout openwrt-18.06-k5.4)
+          sudo chown $USER:$(id -gn) lede && git clone -b openwrt-18.06-k5.4 --single-branch lede
           fi
 
       - name: Update feeds and packages