build: skip unit tests by default (#1102) #2381

Job	Run time
download_test_data	5s
java_matrix	3s
build (ubuntu-latest)	3m 38s
build (macos-latest)	4m 29s
unit_tests (25)	3m 31s
unit_tests (21)	3m 26s
generate_documentation	1m 5s
test_decoder	2m 19s
test_run-groovy	28s
spotbugs	6m 6s
test_clara	3m 47s
test_coatjava (ubuntu-latest, kpp)	4m 47s
test_coatjava (ubuntu-latest, eb-epc)	1m 55s
test_coatjava (ubuntu-latest, eb-ep)	2m 35s
test_coatjava (ubuntu-latest, eb-eftpi)	1m 53s
test_coatjava (ubuntu-latest, eb-eg)	1m 51s
test_coatjava (ubuntu-latest, eb-enc)	2m 6s
test_coatjava (macos-latest, eb-ep, ./run-eb-tests.sh -100 electronproton)	3m 41s
release_build	0s
deploy_web_pages	9s
final	3s
	47m 57s

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