check

add download button #112

Job	Run time
build-and-push-image	42s
lint	28s
list-e2e-tests	8s
build-frontend	2m 9s
run-e2e-tests (./statistics_test.js)	1m 32s
run-e2e-tests (./mapper_test.js)	1m 26s
run-e2e-tests (./settings_test.js)	1m 36s
run-e2e-tests (./random_test.js)	1m 13s
run-e2e-tests (./string_check_test.js)	1m 13s
run-e2e-tests (./histogram_test.js)	1m 29s
run-e2e-tests (./quiz_test.js)	3m 1s
run-e2e-tests (./article_test.js)	3m 2s
run-e2e-tests (./search_test.js)	1m 31s
run-e2e-tests (./comparison_test.js)	1m 44s
	21m 14s

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