Allow to override location of action cache dir (#1863)

Adds an option to specify the directory below which actions
and host workspaces will be stored. If left empty the previous
location at $XDG_CACHE_HOME/act or $HOME/.cache/act will be used
respectively.

Co-authored-by: Casey Lee <cplee@nektos.com>

cmd/input.go

@@ -54,6 +54,7 @@ type Input struct {
 	replaceGheActionWithGithubCom      []string
 	replaceGheActionTokenWithGithubCom string
 	matrix                             []string
+	actionCachePath                    string
 }
 
 func (i *Input) resolve(path string) string {