Add ./do container:dump command and run it within build

[MAILPOET-1605]

.env.sample

@@ -25,3 +25,4 @@ WP_TEST_MAILER_SMTP_PASSWORD=""
 WP_SVN_USERNAME=""
 WP_SVN_PASSWORD=""
 WP_TRANSIFEX_API_TOKEN=""
+WP_ROOT = ""

README.md

@@ -94,6 +94,8 @@ $ ./do delete:docker      # stop and remove all running docker containers.
 $ ./do qa:lint             # PHP code linter.
 $ ./do qa:lint:javascript  # JS code linter.
 $ ./do qa                  # PHP and JS linters.
+
+$ ./do container:dump      # Dumps DI container.
 ```
 
 # Coding and Testing

RoboFile.php

@@ -282,6 +282,21 @@ class RoboFile extends \Robo\Tasks {
     return $this->_exec('vendor/bin/codecept run integration -g failed');
   }
 
+  function containerDump() {
+    $this->say('Deleting DI Container');
+    $this->_exec('rm -f ./lib/DI/CachedContainer.php');
+    $this->say('Generating DI container cache');
+    $this->loadEnv();
+    define('ABSPATH', getenv('WP_ROOT') . '/');
+    if (!file_exists(ABSPATH . 'wp-config.php')) {
+      $this->yell('WP_ROOT env variable does not contain valid path to wordpress root.', 40, 'red');
+      exit(1);
+    }
+    require_once __DIR__ . '/vendor/autoload.php';
+    $container_factory = new \MailPoet\DI\ContainerFactory();
+    $container_factory->dumpContainer();
+  }
+
   function qa() {
     $collection = $this->collectionBuilder();
     $collection->addCode(array($this, 'qaLint'));

build.sh

@@ -22,6 +22,11 @@ test -d node_modules && rm -rf node_modules
 npm install
 ./do compile:all --env production
 
+# Dependency injection container cache.
+echo '[BUILD] Building DI Container cache'
+./composer.phar install
+./do container:dump
+
 # Production libraries.
 echo '[BUILD] Fetching production libraries'
 test -d vendor && rm -rf vendor