refactor: remove unused condition

We do not run merge request pipeline, so no need to check for it

.gitlab-ci.yml

@@ -186,6 +186,7 @@ build_ood_image:
     - export PKR_VAR_flavor="${OOD_BUILD_FLAVOR:-$PKR_VAR_flavor}"
     - export PKR_VAR_build_instance_name="${BUILD_TARGET}-${EXT_REPO_HEAD}"
     - export PKR_VAR_image_date_suffix=false
+    - export PKR_VAR_image_name="${BUILD_TARGET}-${BUILD_DATE}"
     - |
       if [ $ENV = 'knightly' || $ENV = 'prod' ]; then
         curl --header "PRIVATE-TOKEN: ${ANSIBLE_VAR_TOKEN}" \
@@ -196,11 +197,6 @@ build_ood_image:
         'sed -i -E "s/(user_register_app_key: ).*/\1\"${SELF_REG_APP_KEY}\"/" CRI_XCBC/group_vars/$ENV'
         'sed -i -E "s/(celery_user_password: ).*/\1\"${CELERY_PASSWD}\"/" CRI_XCBC/group_vars/$ENV'
         'sed -i -E "s|(ssh_pub_key: ).*|\1\"{{ lookup(''file'', ''${SSH_PUB_KEY}'') }}\"|" CRI_XCBC/group_vars/$ENV'
-    - |
-      if [ $CI_PIPELINE_SOURCE == 'merge_request_event' ]; then
-        export PKR_VAR_image_name="ood-PR-${CI_MERGE_REQUEST_IID}"
-      elif [ $CI_PIPELINE_SOURCE == 'schedule' ]; then
-        export PKR_VAR_image_name="ood-${BUILD_DATE}"
       fi
     # packer commands
     - packer init openstack-ood