Repository navigation

Add repository indexing workflow #9

Job	Run time
Build scip-java CLI	3m 40s
maven-kotlin-json-kotlin-maven	1m 42s
gradle-mixed-okio-jmh	3m 47s
maven-java17-spring-boot	3m 10s
gradle-java11-pusher	2m 43s
bazel-java-examples	2m 26s
gradle-java21-readiness	1m 39s
gradle-kotlin-okio	4m 25s
maven-java11-wagon-multimodule	2m 20s
gradle-kotlin-flowext	3m 38s
gradle-java11-mapstruct-lombok	1m 56s
	31m 26s