The gofumpt check merged stderr into the diff variable, so 'go: downloading ...' lines made it always fail. Move tool installation into its own step (adding GOPATH/bin to PATH) and capture only stdout.
The gofumpt check merged stderr into the diff variable, so 'go: downloading ...' lines made it always fail. Move tool installation into its own step (adding GOPATH/bin to PATH) and capture only stdout.