Generate the version file in the bootstrap script

This file needs to exist before the app can run, so create it automatically
rather than including it as an extra setup step in the README. The API app
already does this.

scripts/bootstrap.sh

@@ -25,6 +25,9 @@ if [ ! $VIRTUAL_ENV ]; then
   . ./venv/bin/activate
 fi
 
+# we need the version file to exist otherwise the app will blow up
+make generate-version-file
+
 # Install Python development dependencies
 pip3 install -r requirements_for_test.txt