**What kind of change does this PR introduce?**
Adds `@puppeteer/ng-schematics` to the list of packages to be published
to `npm`
**Did you add tests for your changes?**
Not relevant.
**If relevant, did you update the documentation?**
Not for in this PR.
**Summary**
We want to publish to `npm` so people can do `ng add
@puppeteer/ng-schematics` and use it with Angular CLI.
**Does this PR introduce a breaking change?**
No
**Other information**
This PR combines the publishing workflows for npm packages and Docker.
It also fixes an issue where multiple tags would trigger publishing all
packages.
This PR moves the puppeteer source code into separate mono-repo packages:
- `puppeteer` and `puppeteer-core` are now separated into their own
packages.
- `puppeteer-core` has a new exports called `puppeteer-core/internal`
for internal usage.
Tests and various tools have been updated to accommodate the migration.
