chore: remove docker credentials for PRs

Author: JenniferMah

.travis.yml

@@ -16,9 +16,12 @@ install:
 - make test-install
 script:
 - make test
+- if [[ "$TRAVIS_BRANCH" == "main"  ||  "$TRAVIS_BRANCH" == "travis" ]] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
+  echo "${DOCKER_PASSWORD}" | docker login -u "${DOCKER_USERNAME}" --password-stdin;
+  fi
 deploy:
 - provider: script
-  script: echo "${DOCKER_PASSWORD}" | docker login -u "${DOCKER_USERNAME}" --password-stdin && make docker-build && make docker-push
+  script: make docker-build && make docker-push
   skip_cleanup: true
   on:
     tags: true