[HELM] Clean up and fix oom helm jobs

Change-Id: I44c198e86f09f06d4ccd6e8b89c111ee49ebee2c
Signed-off-by: efiacor <fiachra.corcoran@est.tech>
Issue-ID: OOM-3065
diff --git a/jjb/oom/oom-main-linter.yaml b/jjb/oom/oom-main-linter.yaml
index 0f49ead..21e6706 100644
--- a/jjb/oom/oom-main-linter.yaml
+++ b/jjb/oom/oom-main-linter.yaml
@@ -1,3 +1,4 @@
+---
 - project:
     name: oom-main-linters
     project: oom