Use existing value of SKIP_RESOURCE_CLEANUP if set in environment

Author: Jont828

scripts/ci-e2e.sh

@@ -57,7 +57,7 @@ export GINKGO_NOCOLOR=true
 export GINKGO_ARGS="${GINKGO_ARGS:-""}"
 export E2E_CONF_FILE="${REPO_ROOT}/test/e2e/config/docker.yaml"
 export ARTIFACTS="${ARTIFACTS:-${REPO_ROOT}/_artifacts}"
-export SKIP_RESOURCE_CLEANUP=false
+export SKIP_RESOURCE_CLEANUP=${SKIP_RESOURCE_CLEANUP:-"false"}
 export USE_EXISTING_CLUSTER=false
 
 # Setup local output directory