update

.github/workflows/build.yml

@@ -31,6 +31,7 @@ jobs:
       id: create_release
       uses: actions/create-release@v1
       continue-on-error: true
+      if: startsWith(github.ref, 'refs/tags')
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       with:
@@ -40,6 +41,7 @@ jobs:
         prerelease: false
     - name: Upload binaries to release for ${{ matrix.os }}
       uses: svenstaro/upload-release-action@v2
+      if: startsWith(github.ref, 'refs/tags')
       with:
         repo_token: ${{ secrets.GITHUB_TOKEN }}
         file: target/release/xbnet