fix(ci): extract only tarball filename from npm pack output

The prepare script (husky install) prints to stdout during npm pack,
corrupting the captured TARBALL variable and failing the global install
smoke test on all platforms.

Author: Rinse12

.github/workflows/CI.yml

@@ -60,7 +60,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          TARBALL=$(npm pack)
+          TARBALL=$(npm pack | tail -1)
           npm install -g "./$TARBALL"
           bitsocial --version