ci: Re-enable rocksdb backend in build.yml

[yihuang]

Description

Closes: #17437

• pin nixpkgs to latest master

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[alexanderbez]

utACK

[mmsqe]

maybe can try add export GOPROXY=https://proxy.golang.org,direct

[yihuang]

maybe can try add export GOPROXY=https://proxy.golang.org,direct

fixed in nixpkgs, but need to wait for it to merge.