fix Chart discovery in helm action

Author: gilesknap

.github/workflows/_helm.yml

@@ -42,7 +42,7 @@ jobs:
           set -xe
 
           mkdir -p charts
-          for i in Charts/*; do
+          for i in $(find Charts -type d -maxdepth 1 -mindepth 1); do
             if [[ ${i} =~ ^.*-ioc$ ]]; then
               echo "Skipping IOC schema chart: ${i}"
               continue
@@ -65,7 +65,7 @@ jobs:
           set -x
 
           echo "${{ secrets.GITHUB_TOKEN }}" | helm registry login ghcr.io/${{ github.repository_owner }} --username ${{ github.repository_owner }} --password-stdin
-          REGISTRY=ghcr.io/${{github.repository_owner }}/charts
+          REGISTRY=oci://ghcr.io/${{github.repository_owner }}/charts
           for i in charts/*.tgz; do
-            helm push "${i}" ${REGISTRY}
+            helm push "${i}" ${REGISTRY,,}
           done