install tar, zip in container

.gitlab-ci.yml

@@ -6,6 +6,7 @@ pages:
   stage: deploy
   script:
   - mkdir public
+  - apk --update add tar zip
   - tar czf public/pandas-tutorial-tasks.tar.gz --transform 's,^,pandas-tutorial-tasks/,' Introduction-to-Pandas--tasks.ipynb Introduction-to-Pandas--solution.ipynb data-lost.json data-nest.csv
   - cp public/pandas-tutorial-tasks.tar.gz .
   - tar xf pandas-tutorial-tasks.tar.gz