staging deploy: load env before manage.py checks

infra/staging/deploy_staging.sh

@@ -22,6 +22,29 @@ chown -R wpp:wpp /opt/wpp-staging/app
 # Staging must not run on SQLite (issue #133). Remove bundled sqlite artifact.
 rm -f /opt/wpp-staging/app/db.sqlite3
 cd /opt/wpp-staging/app
+
+# Load staging env before any manage.py call (issue #133 follow-up).
+ENV_LOADED=0
+for ENV_FILE in \
+  /opt/wpp-staging/.env.staging \
+  /opt/wpp-staging/.env \
+  /opt/wpp-staging/env/wpp_staging.env \
+  /opt/wpp-staging/secrets/wpp_staging.env
+  do
+  if [ -f "${ENV_FILE}" ]; then
+    set -a
+    . "${ENV_FILE}"
+    set +a
+    echo "[deploy] loaded staging env: ${ENV_FILE}"
+    ENV_LOADED=1
+    break
+  fi
+done
+if [ "${ENV_LOADED}" -ne 1 ]; then
+  echo "[deploy] ERROR: no staging env file found"
+  exit 1
+fi
+
 runuser -u wpp -- python3 -m venv .venv
 runuser -u wpp -- .venv/bin/pip install -U pip >/dev/null
 runuser -u wpp -- .venv/bin/pip install -r requirements.txt >/dev/null