Run available extensions doc sync on cron job instead (#115)

Author: derekbekoe

.travis.yml

@@ -35,7 +35,7 @@ jobs:
       python: 3.6
       script: docker run --rm -e TRAVIS_BUILD_ID=$TRAVIS_BUILD_ID -e TRAVIS_REPO_SLUG=$TRAVIS_REPO_SLUG -e TRAVIS_COMMIT=$TRAVIS_COMMIT -e GH_TOKEN=$GH_TOKEN -e DOC_REPO_SLUG='Azure/azure-docs-cli-python' -v $PWD:/repo derekbekoe/az-avail-ext-doc-sync:0.1.2
       env: PURPOSE='SyncAvailableExtensionsDoc'
-      if: repo = Azure/azure-cli-extensions and branch = master and type = push
+      if: repo = Azure/azure-cli-extensions and branch = master and type = cron
   fast_finish: true
   allow_failures:
     - env: PURPOSE='SourceTests'