Fix chart deployment not using long enough git SHA

.gitlab-ci.yml

@@ -64,7 +64,7 @@ build sidecar rabbit init:
     - git clone --depth 1 $repos_url
     - cd ${SUBCOMP_REPOS}
     # most recent docker image should be tagged with most recent SHA
-    - docker_tag=$(git rev-parse --short HEAD)
+    - docker_tag=$(git rev-parse --short=8 HEAD)
     - echo $docker_tag
     - cd chart
     # make the docker tag available in later stages