[s3] Another delimiter + prefix fix for Contents #155

	name: push-to-dockerhub

	on:
	push:
	branches:
	- "master"

	jobs:
	docker:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v3

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

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

	- name: Build
	uses: docker/build-push-action@v4
	with:
	push: true
	tags: \|
	dzbarsky/aws-in-a-box:latest
	dzbarsky/aws-in-a-box:${{ github.sha }}

Provide feedback