update create_sysimage file to remove the replace_default=true option #4

	name: Build plutonotebooks for mybinder.org
	on:
	push:
	branches:
	- main

	jobs:
	binder:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout Code
	uses: actions/checkout@v2
	with:
	ref: ${{ github.event.pull_request.head.sha }}

	- name: update jupyter dependencies with repo2docker
	uses: jupyterhub/repo2docker-action@master
	with:
	DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
	DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
	BINDER_CACHE: true
	PUBLIC_REGISTRY_CHECK: true

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