Add heap flags to production entry script

services/git-bridge/start.sh

@@ -1,3 +1,3 @@
 #!/bin/bash
 /opt/envsubst < /envsubst_template.json > /conf/runtime.json
-exec java -jar /git-bridge.jar /conf/runtime.json
+exec java -Xms512m -Xmx3072m -jar /git-bridge.jar /conf/runtime.json