ci: make graalvm docker image checks required #1185

Job	Run time
build (8, java-bigquery, test)	2m 17s
build (8, java-bigquery, lint)	53s
javadoc-with-doclet (java-bigtable)	1m 21s
javadoc-with-doclet (java-bigquery)	1m 3s
build (8, java-bigquery, clirr)	56s
build (8, java-bigquery, javadoc)	1m 7s
javadoc-with-doclet (java-storage)	1m 19s
javadoc-with-doclet (java-storage-nio)	1m 14s
build (8, java-bigquery, javadoc-with-doclet)	55s
javadoc-with-doclet (java-spanner)	1m 57s
build (8, java-bigtable, test)	2m 58s
javadoc-with-doclet (java-spanner-jdbc)	1m 2s
build (8, java-bigtable, lint)	1m 15s
javadoc-with-doclet (java-pubsub)	1m 10s
build (8, java-bigtable, clirr)	1m 23s
javadoc-with-doclet (java-pubsublite)	1m 20s
build (8, java-bigtable, javadoc)	2m 5s
javadoc-with-doclet (java-logging)	1m 37s
build (8, java-bigtable, javadoc-with-doclet)	1m 9s
javadoc-with-doclet (java-logging-logback)	45s
build (11, java-bigquery, test)	2m 20s
javadoc-with-doclet (java-firestore)	1m 14s
build (11, java-bigquery, lint)	1m 22s
javadoc-with-doclet (java-datastore)	1m 33s
build (11, java-bigquery, clirr)	1m 11s
javadoc-with-doclet (java-bigquerystorage)	1m 3s
build (11, java-bigquery, javadoc)	1m 13s
build (11, java-bigquery, javadoc-with-doclet)	55s
build (11, java-bigtable, test)	3m 10s
build (11, java-bigtable, lint)	1m 35s
build (11, java-bigtable, clirr)	2m 8s
build (11, java-bigtable, javadoc)	2m 25s
build (11, java-bigtable, javadoc-with-doclet)	1m 14s
	49m 9s

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