docker: support retaining at least a few files in backup retention #7490
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Describe the pull request
A clear and concise description of what the pull request is about, i.e. what problem should be fixed?
Link to the issue: #7488
Checklist
Test plan
Verified in my personal deployment environment:
docker build --network host --build-arg https_proxy=$https_proxy --rm --pull -f Dockerfile -t gogs_selfbuild:test .
docker-compose down && sleep 3 && docker-compose up -d
/etc/crontabs/git
:docker exec -it gogs bash cat /etc/crontabs/git