build: beta/stable checkout

Signed-off-by: Eliminater74 <eliminater74@gmail.com>

Author: Eliminater74

.github/workflows/build-openwrt.yml

@@ -129,8 +129,11 @@ jobs:
   build:
     runs-on: ubuntu-20.04
     steps:
-      - name: Checkout
+      - name: Stable Checkout
         uses: actions/checkout@main
+        with:
+          repository: DevOpenWRT-Router/Action_OpenWRT_AutoBuild_Linksys_Devices-TEST
+          ref: stable
 ### ----------------------------------------------------------------- ###
       - name: Build Server Configuration (Information)
         env: