CI: test that angular example works

[Hypnosphi]

Later we can add an integration test as well
did that

[codecov]

Codecov Report

Merging #2557 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2557   +/-   ##
=======================================
  Coverage   32.69%   32.69%           
=======================================
  Files         398      398           
  Lines        8837     8837           
  Branches      941      967   +26     
=======================================
  Hits         2889     2889           
+ Misses       5310     5271   -39     
- Partials      638      677   +39

Impacted Files	Coverage Δ
app/react/src/server/utils.js	0% <0%> (-53.58%)	⬇️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
...ddons/actions/src/containers/ActionLogger/index.js	49.25% <0%> (ø)	⬆️
addons/jest/src/hoc/provideJestResult.js	0% <0%> (ø)	⬆️
addons/actions/src/lib/types/nan/index.js	82.35% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	40% <0%> (ø)	⬆️
...modules/ui/components/stories_panel/text_filter.js	30.98% <0%> (ø)	⬆️
...t-native/src/preview/components/StoryView/index.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_routing.js	24.21% <0%> (ø)	⬆️
lib/codemod/src/transforms/move-buildin-addons.js	46.87% <0%> (ø)	⬆️
... and 45 more

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[ndelangen]

Great catch @Hypnosphi !