Change default branch name

.gitlab-ci.yml

@@ -7,7 +7,7 @@ build-v0.13:
     - mkdir -p /kaniko/.docker
     - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
     - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile.v0.13 --destination $CI_REGISTRY_IMAGE:v0.13.1 --destination $CI_REGISTRY_IMAGE:latest
-build-master:
+build-trunk:
   stage: build
   image:
     name: gcr.io/kaniko-project/executor:debug