PPI-1101 Setup CI

[auto200]

Changes compared to other packages:

on-push:

• do not trigger workflow twice on pull requests

main:

• remove unused workflow_dispatch
• publish package in a single job so we don't have to upload artifacts between jobs and depend on each other
• don't use cache - we can fit within billable minute without it
• package.json as a single source of truth about version number - avoid situations like with https://github.com/PiwikPRO/ngx-piwik-pro/ where version in package.json and release version are out of sync