dev: support both bazel and bazelisk in install scripts. fix dgraph version
diff --git a/apps/dgraph/install.sh b/apps/dgraph/install.sh
index 824ce4a..a9133c8 100755
--- a/apps/dgraph/install.sh
+++ b/apps/dgraph/install.sh
@@ -4,7 +4,7 @@
 helm --namespace=dgraph install --create-namespace init dgraph/dgraph \
      --set fullnameOverride=dgraph \
      --set image.repository=dgraph/dgraph \
-     --set image.tag=latest \
+     --set image.tag=v20.03.7 \
      --set ratel.enabled=False \
      --set zero.replicaCount=1 \
      --set zero.persistence.size=1Gi \