Build PXF release packages with oldest supported cloudberry

[ostinru]

Users cannot use fresh cloudberry-pxf builds with their older cloudberry builds[1]. e.g. pxf-2.1 is not compatible with cloudberry 2.0:

PostgreSQL 14.4 (Apache Cloudberry 2.0.0-incubating build 1) on x86_64-pc-linux-gnu, compiled by gcc (GCC) 11.5.0 20240719 (Red Hat 11.5.0-5.0.1), 64-bit compiled on Aug 2
8 2025 15:25:48
(1 row)

gpafiniti=# create extension pxf;
ERROR: incompatible library "/usr/local/cloudberry-pxf-2.1.0/gpextable/pxf.so": version mismatch (dfmgr.c:371)
DETAIL: Server is version Cloudberry 2, library is version Cloudberry 2.1.

It seems that Cloudberry version is captured during compilation and aaserted in runtime.

[1] apache/cloudberry#1805 (comment)

[ostinru]

Firstly we should choose oldest supported version of cloudberry.
Then, pin it in release pipelines.