Merge branch 'django4' into 'master'

.gitlab-ci.yml

Dockerfile

Dockerfile.binary

arkindex/documents/tests/commands/test_reindex.py

arkindex/documents/tests/test_search_api.py

arkindex/sql_validation/element_dot_delete.sql

arkindex/sql_validation/element_move_with_children.sql

arkindex/sql_validation/element_move_without_child.sql

...dex/sql_validation/worker_results_delete_under_parent.sql

...alidation/worker_results_delete_under_parent_included.sql

base/requirements.txt