Fix GPG verify path for staged release artifacts #561

Job	Run time
check-skip	3s
prepare-test-matrix-deb	9s
Build Apache Cloudberry DEB	14m 29s
DEB Install Test Apache Cloudberry	2m 9s
ic-deb-good-opt-off	25m 39s
ic-deb-good-opt-on	30m 16s
ic-deb-contrib	4m 48s
ic-deb-gpcontrib	4m 32s
pax-ic-deb-good-opt-off	27m 8s
pax-ic-deb-good-opt-on	27m 13s
ic-cbdb-parallel	28m 59s
Generate Apache Cloudberry Build Report	3s
	2h 45m 28s

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