chore: update github actions, #4

	name: Cache Flutter App Version

	on:
	push:
	branches:
	- main

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Read version from pubspec.yaml
	id: read-version
	run: echo "::set-output name=version::$(grep 'version:' pubspec.yaml \| awk '{print $2}')"

	- name: Restore version from cache
	id: cache
	uses: actions/cache@v2
	with:
	path: version
	key: version-${{ steps.read-version.outputs.version }}-${{ runner.os }}

	- name: Check if version is cached
	run: \|
	if [ -f version/version.txt ]; then
	echo "Version is cached: $(cat version/version.txt)"
	else
	echo "Version is not cached"
	fi

	- name: Save version to cache
	run: \|
	echo "${{ steps.read-version.outputs.version }}" > version.txt
	mkdir -p version
	mv version.txt version/
	if: steps.cache.outputs.cache-hit != 'true'

	- name: Use cached version
	if: steps.cache.outputs.cache-hit == 'true'
	run: \|
	echo "Using cached version: $(cat version/version.txt)"

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