TOB6: Security Fix ; Include Checksum Validation Of Dragonwell JDK Download.

[steelhead31]

Fixes #999

Include an integrity check for the Dragonwell JDK8 download. the aarch64 dockerfile does this, so the fix is only required for x64.

Ref: TOB-TEMURIN-6

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[sxa]

Thanks - that's one I was going to try and get to today :-)

[steelhead31]

Thanks - that's one I was going to try and get to today :-)

Hehe, Im picking up little things, as I finish testing the installer changes.

[sxa]

Woohoo - congrats on having issue/PR 1000 in this repo ;-)