Ignore files with extension

I'm trying to skip all the files with `.spec.js` extension in any folder, but it's not working, these files are also copied
```yml
- name: Copy files to production
uses: appleboy/scp-action@master
with:
host: ${{ secrets.SSH_HOST }}
username: ${{ secrets.SSH_USER }}
port: ${{ secrets.SSH_PORT }}
key: ${{ secrets.SSH_KEY }}
source: "package.json,yarn.lock,dist,tmp,uploads,!**/*.spec.js"
target: "~/app"
```
What am I missing?

Start by reproducing the GitHub Actions workflow with the source pattern shown in the issue and inspect how the action handles source paths and exclusions. Done means files ending in .spec.js are omitted from copied files, including those in nested folders.

Written by the indexing model from the issue text.