feat: add flag to always run the checkout action (#1049)

act has a feature that skips the checkout action to do a remote
checkout when a local checkout exists. in some cases, e.g. when
running act in a CI, you always want to clone the repository.

cmd/input.go

@@ -39,6 +39,7 @@ type Input struct {
 	artifactServerPath    string
 	artifactServerPort    string
 	jsonLogger            bool
+	noSkipCheckout        bool
 }
 
 func (i *Input) resolve(path string) string {