fix(deploy): allow direct staging deploy host prefix

infra/docker/deploy-staging.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 set -eu
 
-HOST_PREFIX="${HOST_PREFIX:-/host}"
+HOST_PREFIX="${HOST_PREFIX-/host}"
 ROOT_DIR="$HOST_PREFIX/var/lib/xiaoxia-saas-staging/repo"
 COMPOSE_DIR="$ROOT_DIR/infra/docker"
 ENV_FILE="$HOST_PREFIX/var/lib/xiaoxia-saas-staging/.env"

tests/unit/test_release_scripts.py

@@ -60,7 +60,7 @@ def test_init_production_env_is_non_deploying_and_separated():
 def test_staging_deploy_supports_host_prefix_and_web_build():
     script = Path("infra/docker/deploy-staging.sh").read_text(encoding="utf-8")
 
-    assert 'HOST_PREFIX="${HOST_PREFIX:-/host}"' in script
+    assert 'HOST_PREFIX="${HOST_PREFIX-/host}"' in script
     assert 'ROOT_DIR="$HOST_PREFIX/var/lib/xiaoxia-saas-staging/repo"' in script
     assert 'ENV_FILE="$HOST_PREFIX/var/lib/xiaoxia-saas-staging/.env"' in script
     assert '"$HOST_PREFIX/var/lib/xiaoxia-saas-staging/generated"' in script