use /tmp for npm cache

build-k8s-lenz.jenkins

@@ -134,7 +134,9 @@ pipeline {
                             echo "deb [signed-by=/usr/share/keyrings/yarnkey.gpg] https://dl.yarnpkg.com/debian stable main" | tee /etc/apt/sources.list.d/yarn.list
                             apt-get update
                             apt-get install --no-install-recommends -y yarn nodejs
+                            mkdir -p /tmp/npm/cache
                             cd "${workspace}/lens"
+                            export npm_config_cache=/tmp/npm/cache
                             make build
                         """
                     }