rollup from next branch (#4)

Co-authored-by: sneak <sneak@sneak.berlin>
Reviewed-on: #4

internal/cli/check.go

@@ -0,0 +1,14 @@
+package cli
+
+import (
+	"errors"
+
+	log "github.com/visionmedia/go-cli-log"
+
+	"github.com/urfave/cli/v2"
+)
+
+func (mfa *CLIApp) checkManifestOperation(c *cli.Context) error {
+	log.Error(errors.New("unimplemented"))
+	return nil
+}