Update Dockerfile to use Rocky8 as base...; Port [#18648] to branch-2.10 #15680

Job	Run time
modules: (alluxio.client.cli.,!alluxio.client.cli.fs.)	12m 27s
modules: (alluxio.client.cli.fs.**)	11m 35s
modules: (alluxio.client.fs.,!alluxio.client.fs.concurrent.,!alluxio.client.fs.io.**)	11m 32s
modules: (alluxio.client.fs.concurrent.,alluxio.client.fs.io.)	11m 32s
modules: (alluxio.client.,!alluxio.client.fs.,!alluxio.client.cli.,!alluxio.client.fuse.)	9m 0s
modules: (alluxio.job.,alluxio.master.,alluxio.stress.**)	10m 53s
modules: (alluxio.server.,!alluxio.server.ft.)	10m 1s
	1h 17m 0s

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