feat: add `from_file` resolver + fix cache #107

	---
	name: Python Tests
	on:
	push:
	paths-ignore:
	- 'docs/**'
	branches:
	- master
	- dev
	pull_request:
	paths-ignore:
	- 'docs/**'
	workflow_run:
	workflows:
	- Python Lint
	types:
	- completed

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.8, 3.9, '3.10', '3.11']
	fail-fast: false

	steps:
	- name: Checkout kapitan recursively
	uses: actions/checkout@master
	with:
	submodules: recursive
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install testing dependencies
	run: \|
	sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 762E3157
	sudo apt-get -qq update
	sudo apt-get install -y gnupg2 git curl
	curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3
	chmod 700 get_helm.sh
	sudo ./get_helm.sh
	pip3 install --editable ".[test]"
	pip3 install coverage black
	- name: Run tests
	run: \|-
	make test && make test_coverage

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