Fix validation error of RPC_URL #159

	name: 'tinlake-ui Pull Request'
	on:
	pull_request:
	paths:
	- 'tinlake-ui/**'
	- 'tinlake.js/**'
	- '.github/workflows/tinlake-ui-pull-request.yml'

	jobs:
	build:
	runs-on: ubuntu-latest

	defaults:
	run:
	working-directory: tinlake-ui
	steps:
	- name: Checkout
	uses: actions/checkout@v2

	- name: Setup Node
	uses: actions/setup-node@v2
	with:
	node-version: '12'

	- name: Get Yarn Cache Directory Path
	id: yarn-cache-dir-path
	run: echo "::set-output name=dir::$(yarn config get cacheFolder)"

	- name: Cache Yarn Dependencies
	uses: actions/cache@v2
	with:
	path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
	key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
	restore-keys: \|
	${{ runner.os }}-yarn-

	- name: Install Dependencies
	run: yarn install

	- run: yarn format:check

	- name: Cache Next.js Bundle
	uses: actions/cache@v2
	with:
	path: ${{ github.workspace }}/tinlake-ui/.next/cache
	key: ${{ runner.os }}-nextjs-${{ hashFiles('**/yarn.lock') }}

	- name: Lint
	run: yarn lint

	- name: Build
	run: \|
	cp .env.mainnet-example .env
	yarn export

Provide feedback