Add Dockerfile and docs for building Cloudberry Docker Images #3606

Job	Run time
check-skip	3s
prepare-test-matrix	5s
Build Apache Cloudberry RPM	13m 17s
RPM Install Test Apache Cloudberry	2m 45s
ic-good-opt-off	26m 11s
pax-ic-isolation2-opt-on	23m 42s
ic-gpcontrib	3m 33s
ic-singlenode	7m 49s
pax-ic-good-opt-off	23m 21s
ic-isolation2-hot-standby	4m 50s
ic-isolation2	35m 54s
ic-expandshrink	4m 20s
ic-parallel-retrieve-cursor	4m 5s
ic-good-opt-on	28m 51s
pax-ic-good-opt-on	26m 30s
ic-contrib	4m 41s
ic-resgroup-v2	14m 25s
ic-cbdb-parallel	27m 31s
ic-fixme	4m 10s
ic-diskquota	10m 46s
pax-ic-isolation2-opt-off	23m 6s
ic-isolation2-crash	5m 17s
Generate Apache Cloudberry Build Report	2s
	4h 55m 14s

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