Do not use Heroku CLI on pull requests

Author: JohnTitor

.travis.yml

@@ -9,11 +9,13 @@ before_install:
   - cargo fmt --all -- --check
 install:
   - curl https://cli-assets.heroku.com/install-ubuntu.sh | sh
-before_script:
-  - heroku container:login
-  - heroku container:pull --app=rfcbot-rs web
+before_script: |
+  if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
+    heroku container:login
+    heroku container:pull --app=rfcbot-rs web
+  fi
 script: |
-  heroku container:push --app=rfcbot-rs web
+  if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then heroku container:push --app=rfcbot-rs web; fi
   docker-compose up -d
   docker-compose exec web cargo test --release --locked
 after_failure:
@@ -25,8 +27,10 @@ cache:
   directories:
     - "$HOME/.cargo"
 before_deploy: |
+  if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
     docker-compose exec -e DATABASE_URL=$(heroku config:get DATABASE_URL --app=rfcbot-rs) web \
     diesel migration run
+  fi
 deploy:
   provider: script
-  script: heroku container:release --app=rfcbot-rs web
+  script: if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then heroku container:release --app=rfcbot-rs web; fi