Add private key to test

Author: filiptronicek

.github/workflows/test.yml

@@ -35,6 +35,7 @@ jobs:
       - uses: tauri-apps/tauri-action@v0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAURI_PRIVATE_KEY: ${{ secrets.TAURI_PRIVATE_KEY }}
       - uses: actions/upload-artifact@v2
         with:
           name: ${{ matrix.platform }}