Optimize CI workflow

[Hypnosphi]

Issue: #2179

[codecov]

Codecov Report

Merging #2331 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2331   +/-   ##
=======================================
  Coverage   21.19%   21.19%           
=======================================
  Files         283      283           
  Lines        6156     6156           
  Branches      724      731    +7     
=======================================
  Hits         1305     1305           
+ Misses       4301     4299    -2     
- Partials      550      552    +2

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
app/vue/src/server/utils.js	0% <0%> (-53.58%)	⬇️
addons/a11y/src/components/Report/Tags.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	9.09% <0%> (ø)	⬆️
addons/knobs/src/components/types/Boolean.js	11.62% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/layout/usplit.js	38.7% <0%> (ø)	⬆️
...rc/modules/ui/components/left_panel/text_filter.js	30.98% <0%> (ø)	⬆️
addons/a11y/src/components/Tabs.js	0% <0%> (ø)	⬆️
addons/a11y/src/A11yManager.js	0% <0%> (ø)	⬆️
... and 25 more

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[Hypnosphi]

I made all the other jobs depend on build. This makes overall workflow time for a particular commit a bit longer, but significantly diminishes total time spent on agents, which means that builds will spend less time waiting in queue.

before: https://circleci.com/workflow-run/c7e6c92c-90f4-4746-8b4a-d70c21cf4850
after: https://circleci.com/workflow-run/5317bb4f-c4e9-4163-917a-ec4885f97043

[Hypnosphi]

A further optimisation would be to move the docs and react native bootstrapping from build to the corresponding jobs, so that example-kitchen-sinks don't have to wait for it. Will try it now

[Hypnosphi]

After moving docs bootstrapping to its own job:
https://circleci.com/workflow-run/048fc41b-0150-4a32-9de1-5988e2112a8d

[Hypnosphi]

After moving react-native bootstrapping to its own job:
https://circleci.com/workflow-run/ac85393a-553f-4fbd-9ae5-0a7738e1dcd2

The next step could be moving RN unit-tests to example-react-native (and probably renaming the latter to just react-native)

[Hypnosphi]

And voila — after moving react-native tests to the corresponding job both overall workflow time and total agent time is significantly less:
https://circleci.com/workflow-run/2ca1fd0a-5edd-443d-b6d5-f3c22d669319

[Hypnosphi]

This caches app, addons, and lib directories using current commit hash as a part of the cache key.

bootstrap --core transpiles all the packages in those directories (src to dist).

Ideally, it should be

paths:
  - addons/*/dist
  - app/*/dist
  - lib/*/dist

But unfortunately, wildcards are not supported in cached directories paths

[danielduan]

This is soo awesome, thanks!