Ensure version.json is included in Docker image. Fixes #185

scripts/build.sh

@@ -1,3 +1,4 @@
 #/bin/sh
 ./scripts/echo_version_json.sh > ./app/experimenter/version.json
+cp ./app/experimenter/version.json ./app/version.json
 docker build -f app/Dockerfile -t app:build app/