Add ability to configure file permissions of written files (closes #183) #422

Job	Run time
build-images	1m 5s
cache-deps (linux)	26s
lint (linux)	57s
build (linux)	36s
unit-test (ubuntu-22.04)	36s
unit-test (macos-latest)	38s
Build matrix	21s
integration-tests (change-entry-test.sh)	4m 25s
integration-tests (restore-entry-test.sh)	3m 31s
integration-tests (run-go-test.sh)	2m 46s
integration-tests (run-mysql-test.sh)	2m 53s
integration-tests (run-postgres-test.sh)	2m 55s
	21m 9s

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