Dockerfile: Switch to temurin-8-jdk

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 > [18/22] RUN apt-get -qq update && apt-get install -y adoptopenjdk-8-hotspot=8u282-b08-3:
2.345 E: Unable to locate package adoptopenjdk-8-hotspot
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ERROR: failed to solve: executor failed running [/bin/sh -c apt-get -qq update && apt-get install -y adoptopenjdk-8-hotspot=8u282-b08-3]: exit code: 100
Cleaning up project directory and file based variables

Signed-off-by: Jackeagle <jackeagle102@gmail.com>