Add MSRUSTUP_FEED_URL to env in build-package.yml

Author: sbozcan

.github/workflows/build-package.yml

@@ -10,6 +10,7 @@ env:
   PACKAGING_PASSPHRASE: ${{ secrets.PACKAGING_PASSPHRASE }}
   MSRUSTUP_PAT: ${{ secrets.MSRUSTUP_PAT }}
   CRATES_IO_MIRROR_FEED_TOKEN: ${{ secrets.CRATES_IO_MIRROR_FEED_TOKEN }}
+  MSRUSTUP_FEED_URL: "https://msdata.pkgs.visualstudio.com/Database%20Systems/_packaging/Crates-io-mirror-feed/nuget/v3/index.json"
 on:
   push:
     branches: