Upgrade to ruby 3.0 in the Dockerfile #1238

Job	Run time
build	5m 1s
build	5m 1s
build	5m 1s
test (ruby 3.1 / rails 7.0.4.1 / blacklight latest )	10m 4s
test (ruby 3.1 / rails 7.0.4.1 / blacklight latest )	10m 4s
test (ruby 3.1 / rails 7.0.4.1 / blacklight latest )	15m 1s
test (ruby 3.2 / rails 7.0.4.1 / blacklight latest )	9m 47s
test (ruby 3.2 / rails 7.0.4.1 / blacklight latest )	12m 17s
test (ruby 3.2 / rails 7.0.4.1 / blacklight latest )	12m 17s
test (ruby 3.0 / rails 6.1.7.1 / blacklight 7.33.1 )	10m 3s
test (ruby 3.0 / rails 6.1.7.1 / blacklight 7.33.1 )	10m 3s
test (ruby 3.0 / rails 6.1.7.1 / blacklight 7.33.1 )	12m 20s
test (ruby 2.7 / rails 6.1.7.1 / blacklight 7.33.1 )	10m 4s
test (ruby 2.7 / rails 6.1.7.1 / blacklight 7.33.1 )	10m 4s
test (ruby 2.7 / rails 6.1.7.1 / blacklight 7.33.1 )	13m 6s
test (ruby 3.1 / rails 7.0.4.1 / blacklight 8.0.0 )	10m 5s
test (ruby 3.1 / rails 7.0.4.1 / blacklight 8.0.0 )	10m 5s
test (ruby 3.1 / rails 7.0.4.1 / blacklight 8.0.0 )	10m 5s
test (ruby 3.2 / rails 7.0.4.1 / blacklight 8.0.0 / Propshaft)	10m 6s
test (ruby 3.2 / rails 7.0.4.1 / blacklight 8.0.0 / Propshaft)	10m 6s
test (ruby 3.2 / rails 7.0.4.1 / blacklight 8.0.0 / Propshaft)	10m 7s
	3h 30m 47s

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