chore: Add 's3:HeadObject' action to S3 bucket policies (#488)

Author: imabhichow

cfn/S3EC-GitHub-CF-Template.yml

@@ -86,6 +86,7 @@ Resources:
               - 's3:PutObject'
               - 's3:GetObject'
               - 's3:DeleteObject'
+              - 's3:HeadObject'
             Resource:
               - !Join [ "", [ !GetAtt S3ECGitHubTestS3Bucket.Arn, '/*'] ]
 
@@ -116,6 +117,7 @@ Resources:
               - 's3:PutObject'
               - 's3:GetObject'
               - 's3:DeleteObject'
+              - 's3:HeadObject'
             Resource:
               - !Join [ "", [ !GetAtt S3ECGitHubTestS3BucketAlternate.Arn, '/*'] ]
 
@@ -146,6 +148,7 @@ Resources:
               - 's3:PutObject'
               - 's3:GetObject'
               - 's3:DeleteObject'
+              - 's3:HeadObject'
             Resource:
               - !Join [ "", [ !GetAtt S3ECGitHubTestS3BucketTestVectors.Arn, '/*'] ]