[ninoseki]

A follow up PR for #151.

Caching for go tool doesn't work in CI:

> Run actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e
...
Cache restored successfully
Cache restored from key: setup-go-Linux-x64-ubuntu24-go-1.27.3-6a36259117d6437b71a58905c3aa6b0393ef1250d6165645ca35c91b1819bfb2
...

> Run go tool golangci-lint run
go: downloading github.com/golangci/golangci-lint/v2 v2.15.0
go: downloading charm.land/lipgloss/v2 v2.0.6
go: downloading github.com/gofrs/flock v0.13.1
...

(Cache hits and restored but go tool ... starts downloading)

Doing go mod download beforehand fixes the issue.

The go mod download command is useful mainly for pre-filling the module cache or for loading data to be served by a module proxy.

--- https://go.dev/ref/mod#go-mod-download

> Run actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e
...
Cache restored successfully
Cache restored from key: setup-go-Linux-x64-ubuntu24-go-1.27.3-6a36259117d6437b71a58905c3aa6b0393ef1250d6165645ca35c91b1819bfb2
go version go1.27.3 linux/amd64

> Run go mod download
  go mod download

> Run go tool golangci-lint run
  go tool golangci-lint run
  ...
0 issues.

(No downloading happens)