Add a couple of missing DJANGO_DB_PATH envs to docker builds. Thanks… #1945

Job	Run time
other-tests	1m 33s
chapter-tests (test_chapter_01)	2m 27s
chapter-tests (test_chapter_06_explicit_waits_1)	3m 37s
chapter-tests (test_chapter_03_unit_test_first_view)	2m 39s
chapter-tests (test_chapter_14_database_layer_validation)	4m 35s
chapter-tests (test_chapter_02_unittest)	2m 7s
chapter-tests (test_chapter_15_simple_form)	4m 46s
chapter-tests (test_chapter_10_production_readiness)	3m 56s
chapter-tests (test_chapter_09_docker)	5m 34s
chapter-tests (test_chapter_08_prettification)	4m 10s
chapter-tests (test_chapter_07_working_incrementally)	5m 27s
chapter-tests (test_chapter_04_philosophy_and_refactoring)	2m 18s
chapter-tests (test_chapter_05_post_and_database)	3m 30s
chapter-tests (test_chapter_21_mocking_2)	3m 12s
chapter-tests (test_chapter_23_debugging_prod)	4m 12s
chapter-tests (test_chapter_13_organising_test_files)	3m 23s
chapter-tests (test_chapter_11_server_prep)	2m 38s
chapter-tests (test_chapter_20_mocking_1)	2m 47s
chapter-tests (test_chapter_24_outside_in)	5m 22s
chapter-tests (test_chapter_19_spiking_custom_auth)	2m 54s
chapter-tests (test_chapter_16_advanced_forms)	5m 16s
chapter-tests (test_chapter_17_javascript)	2m 53s
chapter-tests (test_chapter_22_fixtures_and_wait_decorator)	3m 57s
chapter-tests (test_chapter_26_page_pattern)	1m 46s
chapter-tests (test_chapter_25_CI)	2m 56s
chapter-tests (test_chapter_12_ansible)	3m 16s
	1h 31m 11s

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