Add multi_coop configuration via environment variable in docker setup

If the file app_config.defaults.yml exists in the working directory,
the content will be written to the config/app_config.yml and appended
by a configuration entry for every foodcoop in the space separated
environment variable FOODSOFT_FOODCOOPS.

docker-entrypoint.sh

@@ -6,4 +6,17 @@ if [ -f tmp/pids/server.pid ]; then
   rm tmp/pids/server.pid
 fi
 
+if [ -e app_config.defaults.yml ] ; then
+  cat app_config.defaults.yml > config/app_config.yml
+
+  for FOODCOOP in $FOODSOFT_FOODCOOPS; do
+    cat << EOF >> config/app_config.yml
+$FOODCOOP:
+  <<: *defaults
+  database:
+    database: foodsoft_$FOODCOOP
+EOF
+  done
+fi
+
 exec "$@"