Adding 'make test' target to validate chart versions

Change-Id: I5cb8a3914e7643c9b478efea4455cacdd93f9831
diff --git a/.gitignore b/.gitignore
index 05567ce..7873c22 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,6 @@
 # local chart repo dir used when building the http-accessible repo
 chart_repo
 
-# helm-repo-tools repo (in case of local testing)
-helm-repo-tools/
-
 # lockfiles for requirements.yaml for dependent charts
 requirements.lock
 Chart.lock
@@ -11,6 +8,12 @@
 # sub charts directories, created by helm dep ...
 charts
 
+# tagcollisionreject.sh is downloaded via the Makefile if not present
+tagcollisionreject.sh
+
+# helm-repo-tools is cloned in the Makefile if not present
+helm-repo-tools/
+
 # misc files
 .*.swp
 .remote-sync.json