Add repository indexing workflow (#931) #10

Job	Run time
Build scip-java CLI	3m 34s
bazel-java-examples	2m 45s
gradle-java11-mapstruct-lombok	2m 45s
gradle-java11-pusher	2m 41s
maven-java17-spring-boot	2m 42s
maven-kotlin-json-kotlin-maven	2m 52s
maven-java11-wagon-multimodule	3m 5s
gradle-kotlin-okio	3m 52s
gradle-kotlin-flowext	3m 46s
gradle-java21-readiness	1m 37s
gradle-mixed-okio-jmh	3m 18s
	32m 57s

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