Add Renovate Bot for GitLab.

Change-Id: I712cd42b486e6e898472e4f84703cc659a51bc24
diff --git a/renovate/.gitignore b/renovate/.gitignore
new file mode 100644
index 0000000..75002e0
--- /dev/null
+++ b/renovate/.gitignore
@@ -0,0 +1 @@
+/secret.yaml
\ No newline at end of file