Issue #3415234: Add Gitlab CI integration

Closes #3415234

added 4 commits

• b98152f3 - Issue #3415234: Add composer.json description
• 0dc05600 - Issue #3415234: Add Fix PHPCS issues
• 60d2e0c3 - Issue #3415234: Fix PHPstan issues
• 7de8c898 - Issue #3415234: Fix eslint file issues

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added 1 commit

• 2e727663 - Issue #3415234: Add toolbar dependency

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added 1 commit

• 23fb0c84 - Issue #3415234: Fix PHPCS

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added 1 commit

• 73ea1199 - Issue #3415234: Fix PHPCS

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started a merge train

merged