feat(letter-b,letter-c): enable propagation and configure cors #4

	name: Build and publish Letter B
	on:
	push:
	branches:
	- main
	paths:
	- 'b/letter_b/**'
	- 'b/scripts/**'
	- 'b/manage.py'
	- 'b/gunicorn_config.py'
	- 'b/Dockerfile'
	- 'b/otlp.py'
	- 'b/pyproject.toml'
	- 'b/poetry.lock'
	workflow_dispatch:

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Project checkout
	uses: actions/checkout@v4
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3
	- name: Login to DockerHub
	uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKER_HUB_USER }}
	password: ${{ secrets.DOCKER_HUB_PASSWORD }}
	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	platforms: linux/amd64
	push: true
	context: ./b
	file: b/Dockerfile
	tags: \|
	${{ github.repository }}-letter-b:latest
	${{ github.repository }}-letter-b:${{ github.sha }}

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