Fix trying to use multiple .pre stages

.gitlab-ci.yml

 stages:
   - get chart
+  - build prereqs
   - deploy rabbit
   - deploy storage
   - deploy GRB
@@ -36,7 +37,7 @@ build ci:
       when: always
 
 build sidecar rabbit init:
-  stage: .pre
+  stage: build prereqs
   extends: .build_image
   variables:
     IMAGE_NAME: cspp-geo-rabbit-init
@@ -46,7 +47,7 @@ build sidecar rabbit init:
         - sidecars/cspp-geo-rabbit-init/Dockerfile
         - sidecars/cspp-geo-rabbit-init/declare_exchange.py
       when: always
-    - if: $BUILD_SIDECARS
+    - if: $BUILD_PREREQS
       when: always