.github/workflows: add gofmt (goimports) check

Change-Id: Iceb3182827b9c65f28f0351e0e254abe4a95e4de
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f