`golangcilint`: Should pick up local `.golangci.yaml` if possible

[jpmcb]

daggerverse/golangcilint/main.go

Lines 54 to 57 in b3469bf

	// An optional golangci-lint configuration file (.golangci.yml) that
	// replaces the built-in opinionated defaults.
	// +optional
	config *dagger.File,

During a +check we won't always provide the --config argument: should just default to a local .golangci.yaml if it's found