Optionally ignore ACLs

[Since April 2023, buckets by default have ACLs off](https://aws.amazon.com/blogs/aws/heads-up-amazon-s3-security-changes-are-coming-in-april-of-2023/).

Author: khornberg

README.md

@@ -111,12 +111,14 @@ or Openstack Swift
 
 If `endpoint` set the `region` option will be ignored.
 
-*Default:* `[region].s3.amazonaws.com` 
+*Default:* `[region].s3.amazonaws.com`
 
 ### acl
 
 The ACL to apply to the objects.
 
+Set to `false` to not apply any ACLs.
+
 *Default:* `public-read`
 
 ### prefix

index.js

@@ -94,14 +94,17 @@ module.exports = {
           brotliCompressedFilePaths: brotliCompressedFiles,
           prefix: prefix,
           bucket: bucket,
-          acl: acl,
           manifestPath: manifestPath,
           cacheControl: cacheControl,
           expires: expires,
           batchSize: batchSize,
           defaultMimeType: defaultMimeType
         };
 
+        if (acl) {
+          options.acl = acl;
+        }
+
         if (serverSideEncryption) {
           options.serverSideEncryption = serverSideEncryption;
         }

tests/index-test.js

@@ -340,5 +340,22 @@ describe('s3 plugin', function() {
         done(reason);
       });
     });
+
+    it('does not add an ACL', function() {
+      context.config.s3.acl = false
+
+      var plugin = subject.createDeployPlugin({
+        name: 's3'
+      });
+
+      context.uploadClient.upload = function(options) {
+        return RSVP.resolve(options);
+      };
+      plugin.beforeHook(context);
+      return assert.isFulfilled(plugin.upload(context))
+        .then(function(options) {
+          assert.equal(options.acl, undefined, 'acl is not present');
+        });
+    });
   });
 });