fix: warn if secrets not generated

See coop-cloud/organising#499

tests/integration/app_deploy.bats

@@ -328,3 +328,19 @@ teardown(){
   _undeploy_app
   _reset_app
 }
+
+@test "error if no secrets generated" {
+  run sed -i 's/COMPOSE_FILE="compose.yml"/COMPOSE_FILE="compose.yml:compose.extra_secret.yml"/g' \
+    "$ABRA_DIR/servers/$TEST_SERVER/$TEST_APP_DOMAIN.env"
+  assert_success
+
+  run sed -i 's/#SECRET_EXTRA_PASS_VERSION=v1/SECRET_EXTRA_PASS_VERSION=v1/g' \
+    "$ABRA_DIR/servers/$TEST_SERVER/$TEST_APP_DOMAIN.env"
+  assert_success
+
+  run $ABRA app deploy "$TEST_APP_DOMAIN" --no-input --no-converge-checks
+  assert_failure
+  assert_output --partial 'unable to deploy, secrets not generated'
+
+  _reset_app
+}