Adding OS matrix changelog and remove CentOS7 as it is approaching EOL

[peterzhuamazon]

Description

Adding OS matrix changelog and remove CentOS7 as it is approaching EOL

Issues Resolved

Closes opensearch-project/opensearch-build#4379
opensearch-project/opensearch-build#4681

Version

2.15.0+
2.16.0

Checklist

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[Naarcha-AWS]

@peterzhuamazon: Would this be better as a separate file?

[peterzhuamazon]

@peterzhuamazon: Would this be better as a separate file?

Yes it would be better if the compatibility section is standalone.
Would you be able to help on this, Nate ?
I am not very familiar with the docs repo structure 😄

Thanks.

[peterzhuamazon]

We are moving this change to 2.16.0 due to issues here:

• [Deprecation] Properly deprecate CentOS7 as CI build image/Supported OS and switch to Almalinux8 opensearch-build#4379 (comment)

[Naarcha-AWS]

I'll start a PR to spin this off into a separate file around the 2.16 release.

[hdhalter]

@peterzhuamazon - Is this change still coming in 2.16?

[peterzhuamazon]

@peterzhuamazon - Is this change still coming in 2.16?

Yes @hdhalter , we are ready to get it merged for 2.16.0.

Thanks.

[hdhalter]

Hi @Naarcha-AWS , can you please update for 2.16 as per #7287 (comment). Thanks!

[Naarcha-AWS]

@hdhalter and @peterzhuamazon: This on my radar. I'll go ahead and update the PR to add the new file.

[Naarcha-AWS]

@peterzhuamazon: Closing this in favor of #7821. Could you take a look at that PR and make sure the new page captures all the information it should?