Only attempt deployments on upstream repository

Author: c-w

.travis.yml

@@ -41,16 +41,19 @@ deploy:
   - provider: script
     script: tools/cd.sh travis-${TRAVIS_BUILD_NUMBER}
     on:
+      repo: chakki-works/doccano
       branch: master
 
   - provider: script
     script: tools/cd.sh ${TRAVIS_TAG}
     on:
+      repo: chakki-works/doccano
       tags: true
 
   - provider: pages
     skip_cleanup: true
     github_token: $GITHUB_TOKEN
     local_dir: site
     on:
+        repo: chakki-works/doccano
         branch: master