New github action for week3 and week4 #5

	name: Build and Push Docker Image

	on:
	push:
	paths:
	- 'Learn/week3/**'
	- 'Learn/week4/**'
	- 'Learn/week5/**'

	jobs:
	prepare:
	runs-on: ubuntu-latest
	outputs:
	directories: ${{ steps.filter.outputs.changes }}
	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Check changed directories
	id: filter
	uses: dorny/paths-filter@v3
	with:
	filters: \|
	week3: 'Learn/week3/**'
	week4: 'Learn/week4/**'
	week5: 'Learn/week5/**'

	docker-build-push:
	needs: prepare
	if: needs.prepare.outputs.directories != '[]'
	runs-on: ubuntu-latest
	strategy:
	matrix:
	directory: ${{ fromJson(needs.prepare.outputs.directories) }}
	permissions:
	contents: read
	packages: write

	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Login to GitHub Container Registry
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Lowercase repository owner
	id: prep
	run: \|
	echo "OWNER_LOWERCASE=${GITHUB_REPOSITORY_OWNER,,}" >> $GITHUB_OUTPUT
	echo "IMAGE_TAG=${GITHUB_SHA::7}" >> $GITHUB_OUTPUT

	- name: Build and Push
	uses: docker/build-push-action@v6
	with:
	context: ./Learn/${{ matrix.directory }}
	file: ./Learn/${{ matrix.directory }}/Dockerfile
	push: true
	tags: \|
	ghcr.io/${{ steps.prep.outputs.OWNER_LOWERCASE }}/playground-${{ matrix.directory }}:${{ steps.prep.outputs.IMAGE_TAG }}
	ghcr.io/${{ steps.prep.outputs.OWNER_LOWERCASE }}/playground-${{ matrix.directory }}:latest

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