PR #17680 added a new PHP 7.1 Travis build job to generate code coverage report. PHPCS was configured to run on all PHP 7.1 build jobs. So this means that after #17680 was merged, Travis started running PHPCS twice.
This commit fixes this issue by setting a new environment variable called `$RUN_PHPCS` and using this variable, instead of the PHP version, to decide when to run PHPCS.
This commit changes Travis configuration file to specify a list of branches that it should build. This way Travis will only create a new build when a commit is pushed to the master branch and release branches and when tags are created. The behavior for PRs is not modified and PR creation and updates will still trigger builds.
Doing this to speed up Travis build by preventing it from running two builds for PR that are created from a branch of the same repository. Before this change, Travis would create a build when the branch is pushed to GitHub (continuous-integration/travis-ci/push) and another one when the PR is created (continuous-integration/travis-ci/pr). For an example, see https://github.com/woocommerce/woocommerce/pull/17680.
It is not necessary to declare environment variables for a specific build job if they are the same as the environment variables declared for all build jobs.
Travis build is taking about 40 minutes to complete, and that is mostly because of the generation of the code coverage report.
To address that, this commit changes Travis configuration to run the command to generate code coverage report on a separate non-blocking Travis job. This way once the jobs that run the tests finishes, Travisi will mark the build as successful and will keep running code coverage on a separate job.
Claudio Sanches
Rodrigo Primo
Mike Jolley
Akeda Bagus
Ramon van Belzen
Jon Surrell
Claudio Sanches
Aristeides Stathopoulos
Jeff Stieler