Hi @AdityaT, welcome to the Glitch forum!
By default if you use the built-in GitHub export we only export to the Glitch branch since we overwrite the entire branch when exporting and we don’t want to destroy your existing work. You can manage this in GitHub by creating a pull request and merging those changes into your master branch in GitHub. There’s no way built in to change this.
You also have access to the console for your project where you can use git commands directly. It looks like that’s what you’re looking to do from the actions file you sent. Are you running into any specific error you can show us, or can you give us additional information, perhaps including your project name?