Defining DISCOURSE_S3_CDN_URL links to assets in S3 CDN URL

yeah. thanks :slightly_smiling_face:. this fixed the problem.

there is an interesting problem, discourse trying to reach asset files from wrong path. it tries to reach from brotli_asset path but there is no this path in S3 bucket.

Also it tries to reach javascripts and stylesheet files from cdn url. But there are not these files in bucket also.