Update Helm publishing Drone pipeline (#16542)

The drone S3 uploader plugin requires more and/or different permissions than we allow the repository deploy user, and so won't work with the new repository.

This patch changes the promotion pipeline to use s3 sync instead.

.drone.yml

@@ -6537,19 +6537,16 @@ steps:
       - ls /go/chart
 
   - name: "Helm: Publish chart repository to S3"
-    image: plugins/s3
-    settings:
-      bucket:
+    image: amazon/aws-cli
+    environment:
+      AWS_S3_BUCKET:
         from_secret: PRODUCTION_CHARTS_AWS_S3_BUCKET
-      access_key:
+      AWS_ACCESS_KEY_ID:
         from_secret: PRODUCTION_CHARTS_AWS_ACCESS_KEY_ID
-      secret_key:
+      AWS_SECRET_ACCESS_KEY:
         from_secret: PRODUCTION_CHARTS_AWS_SECRET_ACCESS_KEY
-      region: us-east-2
-      acl: public-read
-      source: /go/chart/*
-      target: /
-      strip_prefix: /go/chart
+    commands:
+      - aws s3 sync /go/chart s3://$AWS_S3_BUCKET/ 
 
   # NOTE: all mandatory steps for a release promotion need to go BEFORE this
   # step, as there is a chance that everything afterwards will be skipped.
@@ -7073,6 +7070,6 @@ steps:
     WORKSPACE_DIR: /tmp/build-darwin-amd64-connect
 ---
 kind: signature
-hmac: 734ceb1c15b758c1f8ef2b9e2ff12c15a238b5a3ff4dfcd1965f6dab65c69b6b
+hmac: 1a280d136222885c569a7c4e985fc1927e36dee5e526eb9d0bbc35cd9ddf6f5a
 
 ...