fix/security: do not serve arbitrary files over network with serve-git#1350

cbrnrd merged 1 commit into

mainsourcegraph/src-cli:mainfrom

carterbrainerd-vuln-99-src-serve-git-exposes-arbitrary-files-under-repos-withoutsourcegraph/src-cli:carterbrainerd-vuln-99-src-serve-git-exposes-arbitrary-files-under-repos-withoutCopy head branch name to clipboard