AppRunner: Include commit message in the status

Change-Id: I1c9101df71e004888b0fc38cbc351d77fbcc70bd
diff --git a/apps/app-runner/server.go b/apps/app-runner/server.go
index 1661731..4174ece 100644
--- a/apps/app-runner/server.go
+++ b/apps/app-runner/server.go
@@ -25,8 +25,7 @@
 }
 
 type Status struct {
-	RepoOK   bool            `json:"repoOK"`
-	Commit   string          `json:"commit"`
+	Commit   *Commit         `json:"commit"`
 	Commands []CommandStatus `json:"commands"`
 }
 
@@ -122,12 +121,11 @@
 	commit, err := CloneRepositoryBranch(s.repoAddr, s.branch, s.rootDir, s.signer, newDir)
 	if err != nil {
 		s.status = &Status{
-			RepoOK: false,
+			Commit: nil,
 		}
 		return err
 	}
 	s.status = &Status{
-		RepoOK:   true,
 		Commit:   commit,
 		Commands: []CommandStatus{},
 	}