Add tasks

• Added Task and its TaskRun for cleaning cache of a Drupal site.
• Added Task and its TaskRun for database backup of a Drupal site.
• Added Task and its TaskRun for database restore of a Drupal site.
• Added Task and its Taskrun for editing DrupalSite.spec.publish.

Relates to https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/297

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• 7f8877d8 - Add task to clean cache of drupal site

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• 12125c4c - Move task run to examples and add namespace param

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resolved all threads

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• 072fcce6 - Added roles

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• 790bb7b8 - Add task for database backup of a drupal site
• 834152ca - Fix typo

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changed title from Add task to clean cache of drupal site to Add tasks

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• 37fa9dcd - Add task for database restore of drupal site

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• 1eb9a10d - Remove unneeded command

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• fa9020ba - Add drupal.webservices.cern.ch api group
• 0385b283 - Add task for editing DrupalSite.spec.publish

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approved this merge request

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• d5ad2f07 - Update README.md

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