CI: run packpack job on test stage

Author: yngvar-antonsson

.travis.yml

@@ -94,7 +94,11 @@ jobs:
               -e "s/version = '.+'/version = '$TRAVIS_TAG-1'/g" |
             curl --fail -X PUT -F "rockspec=@-;filename=$ROCK_NAME-$TRAVIS_TAG-1.rockspec"
               https://$ROCKS_USERNAME:$ROCKS_PASSWORD@rocks.tarantool.org
-
+    # Run single packpack job on test stage
+    - <<: *packpack
+      stage: test
+      deploy: []
+      env: OS=el DIST=7
     - <<: *packpack
       env: OS=el DIST=6
     - <<: *packpack