Move variable to default.

Closes #3444601

added 1 commit

• 115320ef - Spacing.

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added 2 commits

• b1678799 - Write DRUPAL_CORE to build.env
• 43240189 - Add PHP_VERSION to build.env

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resolved all threads

added 5 commits

• fbc08a8e - 1 commit from branch project:main
• 6c97b156 - Move variable to default.
• 45c45673 - Spacing.
• e9e092e1 - Write DRUPAL_CORE to build.env
• eb95be6c - Add PHP_VERSION to build.env

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merged