Upload Shell artifacts for easy download after packaging (#1766)

Author: robgruen

.github/workflows/build-package-shell.yml

@@ -87,3 +87,12 @@ jobs:
         working-directory: ts
         shell: bash
         run: pnpm run shell:package
+      
+      - uses: actions/upload-artifact@v4
+        if: ${{ github.event_name != 'pull_request' || steps.filter.outputs.ts != 'false' }}
+        name: Upload build artifact
+        with:
+          name: typeagent-shell-${{ matrix.os }}-${{ github.run_number }} 
+          path: ts/packages/shell/dist/**                             # files/dirs to include
+          retention-days: 7
+