Add shebang line to run-ci.sh

With commit
https://github.com/openbmc/openbmc-build-scripts/commit/55448adb2d4a975e39a3ff991493b686f92ed6a5
run-ci.sh now requires the shebang line (the #! shell interpreter line)
to run.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Ifb02852e127fa6efece2846871a743b051b39ac7
diff --git a/extensions/openpower-pels/registry/run-ci.sh b/extensions/openpower-pels/registry/run-ci.sh
index c0bcc61..55737fd 100755
--- a/extensions/openpower-pels/registry/run-ci.sh
+++ b/extensions/openpower-pels/registry/run-ci.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 /usr/bin/env python3 extensions/openpower-pels/registry/tools/process_registry.py \
 -v -s extensions/openpower-pels/registry/schema/schema.json \
 -r extensions/openpower-pels/registry/message_registry.json