add --force flag

Author: alejandroSuch

Dockerfile

@@ -8,5 +8,6 @@ RUN apk update \
   && ng set --global packageManager=yarn \
   && apk del alpine-sdk python \
   && rm -rf /tmp/* /var/cache/apk/* *.tar.gz ~/.npm \
+  && npm cache clean --force \
   && yarn cache clean \
   && sed -i -e "s/bin\/ash/bin\/sh/" /etc/passwd