Add Dockerfile and docs for building Cloudberry Docker Images #638

Job	Run time
check-skip	3s
Build Apache Cloudberry DEB	15m 22s
prepare-test-matrix-deb	8s
DEB Install Test Apache Cloudberry	1m 53s
ic-deb-good-opt-off	26m 0s
pax-ic-deb-good-opt-off	22m 28s
pax-ic-deb-good-opt-on	27m 25s
ic-deb-good-opt-on	27m 31s
ic-deb-contrib	4m 40s
ic-deb-gpcontrib	4m 1s
ic-cbdb-parallel	28m 9s
Generate Apache Cloudberry Build Report	3s
	2h 37m 43s

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