Add --offline flag and replace elm-json by elm-solve-deps-wasm #688

	# This is a basic workflow to help you get started with Actions

	name: CI

	on: [push, pull_request]

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	test:
	# The type of runner that the job will run on
	runs-on: ubuntu-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- uses: actions/checkout@v3

	- name: Setup Node.js environment
	uses: actions/setup-node@v3
	with:
	node-version: 16.x

	- name: Cache ~/.elm
	uses: actions/cache@v3
	with:
	path: ~/.elm
	key: elm-ubuntu-${{ hashFiles('**/elm.json', 'elm-tooling.json') }}

	- name: Cache node_modules
	id: cache-node_modules
	uses: actions/cache@v3
	with:
	path: node_modules
	key: node_modules-ubuntu-${{ hashFiles('package-lock.json') }}

	- name: npm ci
	if: steps.cache-node_modules.outputs.cache-hit != 'true'
	env:
	NO_ELM_TOOLING_INSTALL: 1
	run: npm ci

	- name: elm-tooling install
	run: npx --no-install elm-tooling install

	- name: Run tests
	run: npm test

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