Travis CI: Improve job performance by caching `node_modules` folder

[netweb]

Example build ​https://travis-ci.org/ntwb/wordpress/jobs/117636801

• ​https://travis-ci.org/ntwb/wordpress/jobs/117636801#L132

  • Setting up build cache
    $ export CASHER_DIR=$HOME/.casher
    $ Installing caching utilities
    
    attempting to download cache archive
    fetching master/cache--php-5.2.tgz
    fetching master/cache--php-5.2.tbz
    could not download cache
    adding /home/travis/build/ntwb/wordpress/node_modules to cache
    

• ​https://travis-ci.org/ntwb/wordpress/jobs/117636801#L1323

  • store build cache
    

• Following build above the node_modules cache:
  • 

Follow up build ​https://travis-ci.org/ntwb/wordpress/jobs/117639151

• ​https://travis-ci.org/ntwb/wordpress/jobs/117639151#L132

  • Setting up build cache
    $ export CASHER_DIR=$HOME/.casher
    $ Installing caching utilities
    
    attempting to download cache archive
    fetching master/cache--php-5.2.tgz
    found cache
    
    adding /home/travis/build/ntwb/wordpress/node_modules to cache
    

Summary:

Before caching node_modules it took npm install ​92.21 seconds to install the NPM modules and after caching was added this was reduced by ~80 seconds to ​11.60 seconds

See also: ​https://docs.travis-ci.com/user/caching/

[ocean90]

In 37058:

Travis CI: Allow to cache the node_modules directory.

This should speed up the installation of npm dependencies.

Props netweb.
Fixes #36291.

[ocean90]

In 40280:

Build/Test Tools: Allow Travis CI to cache the node_modules directory.

Merge of [37058] and [36490] to the 4.4 branch.

See #36291, #36490.

[ocean90]

In 40281:

Build/Test Tools: Allow Travis CI to cache the node_modules directory.

Merge of [37058] and [36490] to the 4.3 branch.

See #36291, #36490.

[ocean90]

In 40282:

Build/Test Tools: Update .travis.yml to include latest improvements from trunk.

• Explicitly use PHPUnit 5.7 for the PHP 7 builds on Travis.
• On Travis CI install and use the node version which is specified in package.json.
• Add some more debugging to Travis and bring the format of the Xdebug fix inline with branches.
• Get Travis builds working on HHVM again.
• In addition, brings the Slack notification settings up to date and allows Travis CI to cache the node_modules directory.

Merge of [40255], [40257-40259], [40269], and [40271] to the 4.2 branch.

See #35105, #40100, #30755, #36291, #36490.

[ocean90]

In 40286:

Build/Test Tools: Update .travis.yml to include latest improvements from trunk.

• On Travis CI install and use node version 0.10.48 to ensure correct node-sass builds.
• Explicitly use PHPUnit 5.7 for the PHP 7 builds on Travis.
• Add some more debugging to Travis and bring the format of the Xdebug fix inline with branches.
• Get Travis builds working on HHVM again.
• In addition, brings the Slack notification settings up to date and allows Travis CI to cache the node_modules directory.

Merge of [40255], [40257],[40259], [40269], and [40271] to the 4.1 branch.

See #35105, #40100, #30755, #36291, #36490.

[ocean90]

In 40288:

Build/Test Tools: Update .travis.yml to include latest improvements from trunk.

• On Travis CI install and use node version 0.10.48 to ensure correct node-sass builds.
• Explicitly use PHPUnit 5.7 for the PHP 7 builds on Travis.
• Add some more debugging to Travis and bring the format of the Xdebug fix inline with branches.
• Get Travis builds working on HHVM again.
• In addition, brings the Slack notification settings up to date and allows Travis CI to cache the node_modules directory.

Merge of [40255], [40257],[40259], [40269], and [40271] to the 4.0 branch.

See #35105, #40100, #30755, #36291, #36490.