Modify demo.yaml to use ubuntu-alpine

Modify demo.yaml and README.md files

Modify mixedDemo.yaml

Modify push_to_test_runner.md

Modify read.me

Запрос на слияние 'CICD_branch_protection_demo' (#1) из CICD_branch_protection_demo в master

update readme.md

добавлена проверка CICD_branch_protection

Merge remote-tracking branch 'refs/remotes/origin/master'

Rename folder workflow into workflows

update push_to_test_runner.md