Fix credentials generation to use Rails runner

bin/start.sh

@@ -11,9 +11,7 @@ echo "[container] Preparing startup checks..."
 # so Rails boot doesn't fail when looking for credentials.yml.enc
 if [ ! -f config/credentials.yml.enc ]; then
   echo "[container] Generating empty encrypted credentials..."
-  bundle exec rails credentials:edit --enroll-mfa=false <<EOF
-
-EOF
+  bundle exec rails runner "Rails.application.encrypted('config/credentials.yml.enc').change { {} }" || true
 fi
 
 # If encrypted credentials are present, validate RAILS_MASTER_KEY before running DB/assets tasks.