Add ability to configure file permissions of written files (closes #183) #420

Job	Run time
cache-deps (linux)	13s
build-images	1m 3s
build (linux)	38s
unit-test (ubuntu-22.04)	44s
lint (linux)	46s
unit-test (macos-latest)	40s
Build matrix	3s
integration-tests (change-entry-test.sh)	3m 35s
integration-tests (restore-entry-test.sh)	3m 32s
integration-tests (run-go-test.sh)	2m 10s
integration-tests (run-mysql-test.sh)	2m 4s
integration-tests (run-postgres-test.sh)	2m 0s
	17m 28s

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