CI: Trim whitespace from parsed staging versionTag in promote

Author: Christdej

.github/workflows/promote_to_production.yml

@@ -39,7 +39,7 @@ jobs:
         id: get_version_tag
         run: |
           TAG_LINE_NUMBER=$(($(grep -n "auroraprodacr.azurecr.io/robotics/flotilla-frontend" k8s_kustomize/overlays/staging/kustomization.yaml |  cut --delimiter=":" --fields=1)+1))
-          VERSION_TAG=$(sed -n "${TAG_LINE_NUMBER}p" k8s_kustomize/overlays/staging/kustomization.yaml  |  cut --delimiter=":" --fields=2)
+          VERSION_TAG=$(sed -n "${TAG_LINE_NUMBER}p" k8s_kustomize/overlays/staging/kustomization.yaml  |  cut --delimiter=":" --fields=2 | tr -d '[:space:]')
           echo "tag=$VERSION_TAG" >> "$GITHUB_OUTPUT"
 
   run_migrations: