fix: init cached activity with None #31

	# This workflow uses actions that are not certified by GitHub.
	# They are provided by a third-party and are governed by
	# separate terms of service, privacy policy, and support
	# documentation.

	# GitHub recommends pinning actions to a commit SHA.
	# To get a newer version, you will need to update the SHA.
	# You can also reference a tag or branch, but the action may change without warning.

	name: Create and publish a Docker image

	on:
	push:
	branches:
	- main
	paths:
	- "**.py"
	- .github/workflows/build-and-publish.yml
	- Dockerfile

	jobs:
	build-and-push-image:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	steps:
	- name: Checkout repository
	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: Log in to the Container registry
	uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_PAT }}

	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ vars.DOCKERHUB_IMAGENAME }}
	github-token: ${{ github.token }}

	- name: Build and push Docker image
	uses: docker/build-push-action@v5
	with:
	context: .
	push: true
	tags: \|
	${{ steps.meta.outputs.tags }}
	${{ vars.DOCKERHUB_IMAGENAME }}:latest
	${{ vars.DOCKERHUB_IMAGENAME }}:${{ github.sha }}
	labels: ${{ steps.meta.outputs.labels }}

Provide feedback