More efficient utilization of github action cache #1805

Job	Run time
build	1m 28s
docker_config_check	16s
extract_locales	2m 1s
build_docs	58s
test_devhub	5m 24s
test_amo_lib_locales_and_signing	4m 35s
test_needs_locales_compilation	3m 20s
test_static_assets	2m 45s
test_test_addons_versions_files_ratings	5m 23s
verify_docker_image	2m 35s
test_es_tests	4m 32s
test_internal_routes_allowed	3m 19s
test_main	5m 21s
test_reviewers_and_zadmin	5m 24s
	47m 21s

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