chore: create a new Dockerfile #9632

Job	Run time
build(8) for gapic-generator-java	11m 22s
build (11)	14m 34s
build(8) except for gapic-generator-java	4m 18s
build (17)	15m 6s
build(21) except self-service clients	13m 22s
compatibility	1m 56s
lint	28s
dependency_analyzer_unit_test	22s
gapic-generator-java-bom	1m 54s
showcase (11)	4m 33s
showcase (17)	4m 43s
showcase-clirr	3m 2s
showcase (21)	4m 29s
showcase-native	8m 46s
unmanaged_dependency_check	6m 11s
	1h 35m 6s

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