Fix artifact handling and slack titles for nightlies #106

Job	Run time
build_testplan	1s
shop_ce / init	2m 21s
shop_ce / prepare_shop (8.1, 5.7)	3m 36s
shop_ce / install_shop (8.1, 5.7)	3m 19s
shop_ce / install_module (skip, 8.1, 5.7)	8s
shop_ce / begin_test_phase	5s
shop_ce / begin_report_phase	2s
shop_ce / phpcs_tests (8.1, 5.7)	1m 4s
shop_ce / actionlint	9s
shop_ce / yamllint	7s
shop_ce / styles	0s
shop_ce / phpunit (8.1, 5.7, ~/phpunit_unit.yml)	1m 8s
shop_ce / phpunit (8.1, 5.7, ~/phpunit_integration.yml)	3m 1s
shop_ce / codeception (8.1, 5.7, ~/codeception_acceptance_70x.yml)	24m 17s
shop_ce / runtest (8.1, 5.7, ~/deprecated_tests.yml)	17m 37s
shop_ce / codeception (8.1, 5.7, ~/codeception_acceptanceSetup_70x.yml)	2m 35s
shop_ce / sonarcloud (8.1, 5.7, -)	2m 33s
shop_ce / sonarcloud (8.1, 5.7, ~/sonarcloud_oxideshop_ce_internal.yml)	1m 34s
shop_ce / finish	31s
	1h 4m 8s

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