Magento2 - allow skipping static deployment of themes which exist in CI/CD pipeline

[johnorourke]

Problem

Deployment of a lot of locales/themes takes a long time (our case - 90 themes x 1-3 locales). Building them all on every deployment is not necessary.

Solution

Use a custom cache or artifact to save the last successful copy of pub/static/frontend/ and then, during the deploy:assets:frontend job, skip themes which already exist.

Changes

In the deployment task, if a flag is set, skip any themes which exist under pub/static/frontend/.

Caveats

• does not handle a new locale being added for an existing theme

Configuration:

Bitbucket pipelines example:

definitions:
  caches:
    magento-static-content:
      key:
        files:
          - app/etc/config.php
          - "app/design/frontend/**/*"
      path: pub/static/frontend

Deploy.php:

set('static_deploy_skip_existing_themes', true);

PR incoming soon.