add flag --auto-approve to tf apply

.gitlab-ci.yml

@@ -20,7 +20,7 @@ build_packer:
   script:
     - terraform --version
     - terraform init
-    - terraform apply
+    - terraform apply --auto-approve
 
 unit-test-job:   # This job runs in the test stage.
   stage: test    # It only starts when the job in the build stage completes successfully.