Dynamically generate plugins list during build #303

Job	Run time
build-geoserver-docker-image (2, 9.0.89-jdk11-temurin-focal, /opt/java/openjdk, 25, 2, https://so...	6m 25s
build-activemq-docker-image	25s
run-scenario-tests (gwc)	1m 41s
run-scenario-tests (login)	2m 13s
run-scenario-tests (stores)	2m 36s
run-scenario-tests (context)	1m 47s
run-scenario-tests (disk-quota)	2m 0s
run-scenario-tests (clustering)	5m 46s
run-scenario-tests (jdbconfig)	2m 12s
scan_image	1m 35s
push-internal-pr-images	3m 29s
	30m 9s

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