New contrib/fixeddecimal: add support for Cloudberry #572

Job	Run time
check-skip	3s
Build Apache Cloudberry DEB	14m 58s
prepare-test-matrix-deb	4s
DEB Install Test Apache Cloudberry	2m 11s
pax-ic-deb-good-opt-on	28m 49s
ic-deb-good-opt-on	30m 41s
pax-ic-deb-good-opt-off	22m 46s
ic-deb-contrib	3m 43s
ic-cbdb-parallel	28m 50s
ic-deb-gpcontrib	4m 35s
ic-deb-good-opt-off	26m 33s
Generate Apache Cloudberry Build Report	4s
	2h 43m 17s

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