Add ability to configure file permissions of written files (closes #183) #408

Job	Run time
cache-deps (linux)	21s
build-images	1m 4s
lint (linux)	51s
unit-test (ubuntu-22.04)	38s
build (linux)	36s
unit-test (macos-latest)	26s
Build matrix	3s
integration-tests (change-entry-test.sh)	3m 25s
integration-tests (restore-entry-test.sh)	3m 30s
integration-tests (run-go-test.sh)	1m 47s
integration-tests (run-mysql-test.sh)	2m 0s
integration-tests (run-postgres-test.sh)	2m 3s
	16m 44s

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