.gitlab-ci.yml: Add "tzdata" package in test stage

.gitlab-ci.yml

@@ -33,7 +33,7 @@ test-job:
   stage: test
   coverage: '/coverage: \d+.\d+% of statements/'
   before_script:
-    - apk update && apk upgrade && apk add nodejs curl build-base libpq-dev libxml2-dev openjdk8-jre sqlite-dev bash
+    - apk update && apk upgrade && apk add nodejs curl build-base libpq-dev libxml2-dev openjdk8-jre sqlite-dev bash tzdata
     - cd hyrax && bundle install --jobs 4 --retry 3
   script:
     - export FITS_PATH=/fits/fits-1.5.5/fits.sh