fix docker mounts — data dir + env path vars

entrypoint.sh

@@ -1,17 +1,6 @@
 #!/bin/sh
 set -e
-
-# If Docker created these paths as directories (because the host file didn't exist),
-# remove them and create proper JSON files.
-for f in /app/colony.json /app/decks.json; do
-  if [ -d "$f" ]; then
-    rm -rf "$f"
-  fi
-  if [ ! -f "$f" ]; then
-    echo '{}' > "$f"
-  fi
-done
-
-mkdir -p /app/assets/deck-images
-
+mkdir -p /app/data /app/assets/deck-images
+[ -f /app/data/colony.json ] || echo '{"games":[]}' > /app/data/colony.json
+[ -f /app/data/decks.json  ] || echo '{"decks":[]}'  > /app/data/decks.json
 exec node server.js