feat: add polardb.conf.sample into packages #44

Job	Run time
regression (rocky8, precheck-main, on)	23m 27s
regression (rocky8, precheck-main, off)	23m 28s
regression (rocky8, plcheck, on)	17m 48s
regression (rocky8, plcheck, off)	13m 50s
regression (rocky9, precheck-main, on)	23m 11s
regression (rocky9, precheck-main, off)	22m 9s
regression (rocky9, plcheck, on)	16m 23s
regression (rocky9, plcheck, off)	14m 17s
regression (ubuntu22.04, precheck-main, on)	22m 6s
regression (ubuntu22.04, precheck-main, off)	22m 15s
regression (ubuntu22.04, plcheck, on)	15m 14s
regression (ubuntu22.04, plcheck, off)	12m 49s
	3h 46m 57s

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