ci: ignore stale project venv in runner

.gitea/workflows/ci-cd.yml

@@ -84,6 +84,7 @@ jobs:
       - name: Install Python and uv
         run: |
           set -euo pipefail
+          rm -rf .venv .ci-python-env
           PROJECT_PYTHON_VERSION="$(cat .python-version 2>/dev/null || printf '%s' "${PYTHON_VERSION}")"
           PYTHON_BIN="$(./scripts/ensure-ci-python.sh "${PROJECT_PYTHON_VERSION}")"
 

scripts/ensure-ci-python.sh

@@ -33,6 +33,11 @@ python_has_venv() {
 
 print_if_usable() {
   local candidate="$1"
+  case "${candidate}" in
+    "${PWD}/.venv/"*)
+      return 1
+      ;;
+  esac
   if python_matches "${candidate}" && python_has_venv "${candidate}"; then
     printf '%s\n' "${candidate}"
     exit 0