[FLINK-34419][docker] Add tests for JDK 17 & 21

[morazow]

[FLINK-34419]: Updated tests to use JDK 17 and 21 versions in dev-master

[XComp]

Switching back to not-approved to discuss the matrix approach of your first commit. :)

[morazow]

Thanks @XComp, I'll ping you again once I update it

[morazow]

Morning @XComp,

I have updated the PR accordingly. I had to set the max-parallel job to 1, otherwise the occasionally the docker container names (jobmanager or taskmanager) would clash and fail to start.

I could change the test scripts to name containers so they don't clash. Please let me know.

[XComp]

Can you separate the commit:

• [hotfix][ci] Updates actions
• [hotfix][ci] Utilize matrix strategy in GHA workflow
• [FLINK-34419][docker] Adds JDK17 and JDK21 support

[morazow]

Fixed! I also changed accordingly other branches

[morazow]

Another off-topic point, the tests build and package a job using mvn package command. This step pulls many transitive dependencies. Should we add GitHub action to cache the mvn jars in this issue? Or should we address it separately?

[morazow]

@XComp please have a look again. If this looks good, I will backport to other branches accordingly, thanks 🙏

[XComp]

Looks good to me. 👍 Thanks. Can you please merge the parallelism hotfix commit into matrix hotfix commit? There's no reason to keep these two separate.

[morazow]

Thanks @XComp for looking into 🙏 I have squashed it as you suggested, fixed.

I will update the other PRs similar to this one tomorrow. Thanks a lot!

[XComp]

Ok, ping me when you're done updating PR #183 and PR #184

[morazow]

Thanks @XComp, I have updated both pull requests