Reenable caching of static files in Varnish #6220

Job	Run time
Check OpenAPI specification	4m 41s
Check PHP version	21s
Check Drupal Config	4m 28s
Run Cypress functional tests	9m 46s
Lint Cypress tests	38s
Lint Drupal assets	40s
Test site performance using Lighthouse	6m 13s
Lint Markdown	38s
Test accessibility using Pa11y	4m 57s
Check code style	23s
Analyse code using PHPStan	32s
Run PHP unit tests	46s
Shellcheck	5s
Check Twig code style	22s
Validate Composer	21s
	34m 51s

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