tapdb: backup sqlite db before running database migration #2859

Job	Run time
cross compilation	4m 16s
Docker build check	3m 7s
Compilation check	35s
Format check	24s
run itests	7m 22s
run itests postgres	14m 30s
Lint check	2m 27s
migration version check	17s
go mod check	24s
RPC check	1m 4s
sample configuration check	40s
Sqlc check	31s
test vector check	50s
run unit tests (unit-race)	6m 54s
run unit tests (unit-cover)	2m 35s
run unit tests (unit dbbackend=postgres)	4m 57s
	50m 53s

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