There are now 3 modes for deployment: next, stable, archive.
We compute which mode (and other deployment properties)
from the `TRAVIS_BRANCH` and the `STABLE_BRANCH`.
If the TRAVIS_BRANCH is master we deploy as "next".
Otherwise if the branch is the highest of its minor versions
we deploy as "stable" if the `TRAVIS_BRANCH` matches the `STABLE_BRANCH` or
else "archive".
For "archive" deployments we compute the firebase project and deployment
url based on the major version of the `TRAVIS_BRANCH`.
As well as choosing where to deploy the build, we also use this
to select the environment file for the AIO Angular app.
This will enable the app to change its rendering and behaviour
based on its mode.
See #18287
You can now specify what environment you are building
by add it to the `yarn build` command. For example:
```
yarn build -- --env=stage
```
Moreover the `deploy-to-firebase.sh` script will automatically apply the
appropriate environment.
All the docs related files (docs-app, doc-gen, content, etc)
are now to be found inside the `/aio` folder.
The related gulp tasks have been moved from the top level
gulp file to a new one inside the `/aio` folder.
The structure of the `/aio` folder now looks like:
```
/aio/
build/ # gulp tasks
content/ #MARKDOWN FILES for devguides, cheatsheet, etc
devguides/
cheatsheets/
transforms/ #dgeni packages, templates, etc
src/
app/
assets/
content/ #HTML + JSON build artifacts produced by dgeni from /aio/content.
#This dir is .gitignored-ed
e2e/ #protractor tests for the doc viewer app
node_modules/ #dependencies for both the doc viewer builds and the dgeni stuff
#This dir is .gitignored-ed
gulpfile.js #Tasks for generating docs and building & deploying the doc viewer
```
Closes#14361
Peter Bacon Darwin
Igor Minar
Ward Bell