Issue #3390778: Add configuration for Gitlab CI, PHPStan, PHPCS

This builds on 1.x rather than the MR in !3 (closed) building on top of disruptive branch in !2 (closed).

changed title from Gitlab ci on 1.x to Issue #3390778: Add Gitlab CI configuration

changed the description

added 7 commits

• 5b9892ff - ci, built on top of mr2
• c8cb0c11 - solve for dependency on _doctrine depending on root package
• 3bba790b - maybe
• 515c03df - maybe2
• 70689df5 - remove it for now
• 95421e58 - rm tests
• d8700691 - add back

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added 1 commit

• 967d985a - remove rogue new config module

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added 3 commits

• 740034be - Issue #3390778 by dpi: Add Gitlab CI configuration
• 6ed893e0 - Issue #3390777 by dpi: Add PHPStan and enforce it via CI
• 7ce6ae4a - Issue #3390776 by dpi: Add PHPCS and enforce it via CI

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added 1 commit

• 2cdb16c7 - Issue #3390776 by dpi: Add PHPCS and enforce it via CI

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changed title from Issue #3390778: Add Gitlab CI configuration to Issue #3390778: Add configuration for Gitlab CI, PHPStan, PHPCS

merged