Tidy up release_download_test.sh

[netomi]

This PR adds support for the following things:

• support for running the script on machines other than linux-aarch64
• add support for output coloring if ansi terminal is available
• add support for additional options to ease testing (e.g. keep workspace instead of downloading all files of a release all the time)
• adding helper functions for common things like printing errors

Some things I want to add in a further PR:

• validation of signatures for all files of a mac binary using: https://github.com/indygreg/apple-platform-rs
• validation of signatures for all files of a windows binary using: https://github.com/mtrojnar/osslsigncode
• support for all of the included validations for a single binary, e.g. OpenJDK21U-jdk_x64_linux_hotspot_21.0.1_12.tar.gz
• so that consumers of temurin can validate if the binary they want to use passes all validation and they dont have to validate all binaries of a release which is quite a lot

@mbarbero @sxa

[github-actions]

Thank you for creating a pull request!
If you have not done so already, please familiarise yourself with our Contributing Guidelines and FAQ, even if you have contributed to the Adoptium project before. GitHub actions will now run a set of jobs against your PR that will lint and unit test your changes. Keep an eye out for the results from these on the latest commit you submitted. For more information, please see our testing documentation.

[sxa]

LGTM - running one final test against jdk-17 then I'll get it merged :-) Thanks for the cleanup!

[sxa]

Hmm the last test I did on jdk-17.0.9+9 failed for the win32 zip files as though the download didn't complete, but it did produce a file of the right size. Trying again ...

[netomi]

can you provide a link to the jienkins job for inspection?

[sxa]

can you provide a link to the jienkins job for inspection?

It's restricted, so not easily but it looks like it might be reproducible outside jenkins anyway when you run against jdk-17.0.9+9 - trying to run a few further tests now