fixed buildspec

Author: gornostal

mq/server/buildspec.yml

@@ -17,7 +17,7 @@ phases:
     commands:
       - export DOCKER_LOGIN="$(aws ecr get-login --no-include-email --region us-east-1)"
       - eval $DOCKER_LOGIN
-      - export GIT_REF="$(git show-ref | grep $CODEBUILD_SOURCE_VERSION | grep -iv head)"
+      - export GIT_REF="$(git show-ref | grep $CODEBUILD_SOURCE_VERSION | grep -iv head | sort | tail -n 1)"
       # GIT_REF_TYPE can be either "origin" (for branches) or "tags"
       - export GIT_REF_TYPE="$(echo "$GIT_REF" | awk -F "/" '{print $(NF-1)}')"
       # GIT_REF_NAME is either a branch or tag name