[Snyk] Security upgrade alpine from 3.4 to 3.13.7#1

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masterdalejrodriguez/git-server-docker:masterfrom

snyk-fix-329f2be111d1c04b1cf06a3c6c394314dalejrodriguez/git-server-docker:snyk-fix-329f2be111d1c04b1cf06a3c6c394314Copy head branch name to clipboard