Improve Feature Branch Checks

[ygrishajev]

We have docker images builds running in feature branches as a check. However we need to implement a generic workflow to test more aspects of our apps.

Acceptance criteria:

• create a generic workflow which would be running the following checks against a given app: tests, code linting and formatting, build image
• every app should be added a command to run via the workflow: e.g. npm run lint, npm run format, npm run test

Note: smth is already implemented for api and can be taken as a base .github/workflows/validate-n-build-api.yml