update: build workflow checkout to v3 #15

	name: Build and Push Docker Images

	on:
	push:
	branches:
	- main

	env:
	DOCKER_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
	DOCKER_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}

	jobs:
	build-and-push:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v3

	- name: Login to Docker Hub
	run: echo "$DOCKER_PASSWORD" \| docker login -u "$DOCKER_USERNAME" --password-stdin

	- name: Determine changed Dockerfiles
	id: find-dockerfiles
	run: \|
	changed_files=$(git diff --name-only HEAD~1 \|\| git ls-files --exclude='*')
	dockerfiles=$(find . -name "Dockerfile" -printf '%P\n')

	changed_dockerfiles=""
	for file in $dockerfiles; do
	if [[ $changed_files == "$file" ]]; then
	changed_dockerfiles+=" $file"
	fi
	done

	echo "::set-output name=changed_dockerfiles::$changed_dockerfiles"

	- name: Build and push Docker images
	run: \|
	for dockerfile in ${{ steps.find-dockerfiles.outputs.changed_dockerfiles }}; do
	folder=$(dirname $dockerfile)
	docker build -t dinifarb/activemq:"$folder" "$folder"
	docker push dinifarb/activemq:"$folder"
	done

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