ci: invalidate bad pip cache

.gitlab-ci.yml

@@ -4,6 +4,7 @@ variables:
   GIT_SUBMODULE_STRATEGY: recursive
 
 cache:
+  key: sphinx-build-env-docs-001
   paths:
   - .venv
   - .cache

venv-build-env.sh

-#!/bin/sh
+#!/bin/sh -ex
 # Source this script like `. ./venv-build-env.sh`
 if [ ! -e ./.venv ]; then
    python3 -m venv .venv