fix: use proper conditional expression for token fallback

- Use conditional expression to check if GH_PAT exists before using it
- Fallback to GITHUB_TOKEN if GH_PAT is not set or empty
- This fixes the 'token not supplied' error

.github/workflows/build-reusable.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           submodules: recursive
           fetch-depth: 1
-          token: ${{ secrets.GH_PAT || secrets.GITHUB_TOKEN }}
+          token: ${{ secrets.GH_PAT != '' && secrets.GH_PAT || secrets.GITHUB_TOKEN }}
           ref: ${{ inputs.ref }}
 
       - name: Install uv and Python
@@ -95,7 +95,7 @@ jobs:
         with:
           submodules: recursive
           fetch-depth: 1
-          token: ${{ secrets.GH_PAT || secrets.GITHUB_TOKEN }}
+          token: ${{ secrets.GH_PAT != '' && secrets.GH_PAT || secrets.GITHUB_TOKEN }}
           ref: ${{ inputs.ref }}
 
       - name: Install uv and Python