migrate CI/CD pipeline to GitHub Actions from Jenkins

[MikhailDeriabin]

📄 Pull Request Overview

Closes #670

CI/CD pipeline now runs in GitHub Actions instead of Jenkins.
It is recommended to read the wiki pages describing pipeline in details. The wiki pages was written for API pipeline, but both pipelines are the same and therefore the wiki is also applicable for this repo.

🔧 Changes Made

1. Archived Jenkinsfile, Jenkins will be disabled. Later I will also remove its instance from the server.
2. Added ci-cd.yaml for pipeline in GH Actions with steps:
   • Run tests
   • Build and push image to docker hub (for dev and main)
   • Update image on prod server (for dev and main)
3. Archived previous ci.yaml file, which was running tests. Now its steps are included in the ci-cd.yaml.
4. Added config for Codecov with code coverage requirements. The coverage target is set to 1%, and it will not fail CI even if coverage is below 1%. I can not decide what value should be set, as I think the decisions should be done by developers if this repo.
5. Added project codecov badge to README with code coverage of the repo, just for fun. It should start working once the PR is merged to dev. You can also remove it, if not needed.

[codecov-alt]

Codecov Report

✅ All modified and coverable lines are covered by tests.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.