There have been some issues lately with Travis jobs failing due to
`print-log.sh`. This is likely due to trying to print the Lighthouse PWA report,
which is too large.
This commit stops printing that report (since it was rarely used and is pretty
easy to acquire when needed) and restores the `print-logs.sh` script (that was
temporarily removed with dfcca66fd).
Previously, there was an issue with testing the PWA score on staging and failing
the build was temporarily disabled. It works now, so we need to enable failing
the build is the score drops below some threshold.
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.
The current stable branch is determined based on the current version mapped to
the npm `latest` tag (by replacing the patch version number with 'x' - e.g.
`1.2.3` --> `1.2.x`).
PRs against the stable branch will be deployed to the preview server (as long as
the rest of the requirements are met). Commits on the stable branch itself will
be deployed to production.
Fixes#16908
