Call produce-sha256 only once

Fixing https://github.com/rancher/partner-charts/pull/41.

Related Issue: https://github.com/rancher/rancher/issues/29121

scripts/ci-wrapper

@@ -9,9 +9,7 @@ git fetch origin ${1}
 git checkout origin/${1} ./assets/index.yaml || true
 git checkout origin/${1} ./sha256sum || true
 
-charts=$(./scripts/produce-sha256)
-
 # produce-sha256 produces sha256 and print out chart name that has changed, and only run CI against changed chart
 for i in $(./scripts/produce-sha256); do
     ./scripts/ci $i
-done
+done