docs: Update README.md #19

	name: Docker Image CI

	# 이벤트
	# main 브랜치에 한하여 push가 일어날 경우
	on:
	push:
	branches: ['main']

	# jobs
	# 이벤트가 발생하면 해야 할 작업
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2

	- name: Login to DockerHub
	uses: docker/login-action@v2
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_PASSWORD }}

	- name: Set time
	run: \|
	echo "NOW=$(date "+%Y%m%d%H%M%S")" >> $GITHUB_ENV

	- name: Build and push
	uses: docker/build-push-action@v3
	with:
	context: .
	push: true
	tags: ${{ secrets.DOCKERHUB_USERNAME }}/${{ secrets.DOCKER_IMAGE_NAME }}:${{ env.NOW }}

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