feat: add json logger output (#1026)

* feat: add json logger output

This will allow to format log output as json.
This is helpful in cases where act is not executed on a 'local' machine.

* refactor: use runner config

Using the runner config to configure logging is cleaner.

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

cmd/input.go

@@ -38,6 +38,7 @@ type Input struct {
 	autoRemove            bool
 	artifactServerPath    string
 	artifactServerPort    string
+	jsonLogger            bool
 }
 
 func (i *Input) resolve(path string) string {