Adding custom http headers to the wercker s3sync step (https://app.wercker.com/#applications/51c82a063179be4478002245/tab/details)

wercker.yml

deploy:
    steps:
        s3sync:
            key-id: $KEY
            key-secret: $SECRET
            bucket-url: $BUCKET
            source-dir: $SOURCE
            opts: --add-header="Cache-Control:max-age=3600, public"

Thanks.

http://manuelgruber.com/2014/jekyll-auto-publish-aws-s3-cloudfront/