ci: added ref to checkout correct version

Author: andreszorro

.github/workflows/test-build.yaml

@@ -73,6 +73,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+          ref: ${{ contains(github.ref, '-beta') && 'develop' || 'main' }}
       - name: Output version
         run: |
           jq -r '.version' package.json > TESTED_VERSION.txt