DEV-997 fixed ansible builder step

- added missing stage variable

.gitlab-ci.yml

@@ -37,7 +37,7 @@ lint-job:
   script:
     - cp $SSH_KEY_GITLAB_CI_BUILDER_FILE ansible-builder/context/id_ed25519
     - echo "Running docker build to build awx execution environment"
-    - docker build -f ansible-builder/context/Dockerfile -t $AWX_EE_DOCKER_IMAGE_EXTERN:latest .
+    - docker build -f ansible-builder/context/Dockerfile -t ${STAGE}-$AWX_EE_DOCKER_IMAGE_EXTERN:latest .
     - docker push ${STAGE}-${AWX_EE_DOCKER_IMAGE_EXTERN}:latest
   except:
     - schedules