[ci] Only puts sigma.min.js in release

This commit is related to #1450.

Putting in the releases the rest of the built files make no sense, in my
opinion.

.github/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
         uses: svenstaro/upload-release-action@v2
         with:
           repo_token: ${{ secrets.GITHUB_TOKEN }}
-          file: ./packages/sigma/dist/*
+          file: ./packages/sigma/dist/sigma.min.js
           tag: ${{ github.ref }}
           overwrite: true
           file_glob: true