Add ability to configure file permissions of written files (closes #183) #384

Job	Run time
cache-deps (linux)	16s
build-images	1m 6s
unit-test (ubuntu-22.04)	38s
build (linux)	37s
unit-test (macos-latest)	44s
lint (linux)	43s
Build matrix	7s
integration-tests (change-entry-test.sh)	3m 40s
integration-tests (restore-entry-test.sh)	3m 49s
integration-tests (run-go-test.sh)	1m 51s
integration-tests (run-mysql-test.sh)	1m 56s
integration-tests (run-postgres-test.sh)	1m 57s
	17m 24s

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