Export tag on release branch only

Author: dsimansk

openshift/e2e-common.sh

@@ -112,6 +112,9 @@ install_serverless_operator() {
   if ! git ls-remote --heads --exit-code "$repository" "$so_branch" &>/dev/null; then
       echo "Release branch doesn't exist yet, using main"
       so_branch="main"
+  else
+    USE_IMAGE_RELEASE_TAG="${project_tag}"
+    export USE_IMAGE_RELEASE_TAG
   fi
 
   local operator_dir=/tmp/serverless-operator
@@ -122,12 +125,10 @@ install_serverless_operator() {
   pushd $operator_dir
 
   export SKIP_MESH_AUTH_POLICY_GENERATION=true
-  USE_IMAGE_RELEASE_TAG="${project_tag}"
-  export USE_IMAGE_RELEASE_TAG
   export ON_CLUSTER_BUILDS=true
   export DOCKER_REPO_OVERRIDE=image-registry.openshift-image-registry.svc:5000/openshift-marketplace
 
-  make generated-files images install-serving install-eventing || failed=1
+  make images install-serving install-eventing || failed=1
   subheader "Successfully installed serverless operator."
 
   # Workaround default 'https' scheme