Add --skip-upload input with latest helm/chart-releaser-action (#143)

* feat: add option --skip-upload, to not handle index.yaml for OCI charts

Signed-off-by: acuD1 <arsciand@student.42.fr>

* docs: update README.md for --skip-upload

Signed-off-by: acuD1 <arsciand@student.42.fr>

---------

Signed-off-by: acuD1 <arsciand@student.42.fr>

action.yml

@@ -42,6 +42,9 @@ inputs:
   skip_existing:
     description: "Skip package upload if release exists"
     required: false
+  skip_upload:
+    description: "Skip package upload"
+    required: false
   mark_as_latest:
     description: Mark the created GitHub release as 'latest'
     required: false
@@ -101,6 +104,10 @@ runs:
             args+=(--skip-existing "${{ inputs.skip_existing }}")
         fi
 
+        if [[ -n "${{ inputs.skip_upload }}" ]]; then
+            args+=(--skip-upload "${{ inputs.skip_upload }}")
+        fi
+
         if [[ -n "${{ inputs.mark_as_latest }}" ]]; then
             args+=(--mark-as-latest "${{ inputs.mark_as_latest }}")
         fi