Deployer - Install Dev Dependencies
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I was looking for a way in deployer to install the composer dev dependencies on a staging site but without affecting deployments to the live site.
I managed to get it working using the below. At first it failed because I was missing
install which I thought was strange since I assumed that only the options would be changed and not the action of the composer command.
// remove --no-dev flag for staging
->set('composer_options', 'install --verbose --prefer-dist --no-interaction --optimize-autoloader')