Finishing make app refactor.

all-apps/instance-control/b0.0.1/make-instance-control-config.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -e
+set -a # export everything in the config for later use by envsubst
+
+. $1 # source the apps.config file with then env vars
+
+# substitute template with env var to insert webhooks secret
+envsubst < app/instance-control/hooks/hooks.json.tmpl > app/instance-control/hooks/hooks.json