Add JDK 8 to CI

[ohltyler]

Signed-off-by: Tyler Ohlsen [email protected]

Description

Adds JDK8 to CI.

Issues Resolved

Resolves #320

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[ohltyler]

@dblock there has been a manual build of protostuff jars by @kaituo built with JDK11 (#374), which causes failures when running against JDK8. Note it was originally built with JDK14 (#373) but caused infra distribution build failures, since those run on JDK11. So I think the path with the least amount of friction is to not run CI against JDK8.

Workflow failure:

bad class file: /home/runner/work/anomaly-detection/anomaly-detection/lib/protostuff-api-1.8.0-SNAPSHOT.jar(io/protostuff/LinkedBuffer.class)
    class file has wrong version 55.0, should be 52.0

[ylwu-amzn]

Manual built protostuff is to fix this #263, @dblock, do you think it's ok to not fix that warning? It will be best if we can push protostuff team to publish a new version fixing that issue.

[dblock]

Fixing in #418.