convert to h2 #95

Job	Run time
projects (ubuntu-latest, jdk_17_maven)	10m 56s
projects (windows-latest, jdk_8_maven)	13m 54s
projects (ubuntu-latest, jdk_8_maven)	9m 55s
projects (windows-latest, jdk_11_maven)	15m 51s
projects (ubuntu-latest, jdk_8_gradle)	5m 55s
projects (ubuntu-latest, jdk_17_gradle)	6m 25s
projects (ubuntu-latest, jdk_11_gradle)	6m 51s
projects (windows-latest, jdk_21_maven)	7m 18s
projects (windows-latest, jdk_17_maven)	14m 32s
projects (macos-latest, jdk_8_maven)	36m 53s
projects (windows-latest, jdk_11_gradle)	9m 22s
projects (ubuntu-latest, jdk_11_maven)	11m 20s
projects (ubuntu-latest, jdk_21_maven)	5m 22s
projects (windows-latest, jdk_17_gradle)	8m 30s
projects (windows-latest, jdk_8_gradle)	8m 29s
projects (macos-latest, jdk_17_gradle)	18m 52s
projects (macos-latest, jdk_21_maven)	15m 0s
projects (macos-latest, jdk_17_maven)	27m 24s
projects (macos-latest, jdk_11_gradle)	22m 17s
projects (macos-latest, jdk_11_maven)	23m 46s
projects (macos-latest, jdk_8_gradle)	16m 32s
	4h 55m 24s

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