Configure Arc S3 for Phoenix project

config-arc-s3-for-phoenix.exs

config :arc,
  virtual_host: true,
  version_timeout: 60_000, # milliseconds
  bucket: System.get_env("AWS_S3_BUCKET")

config :ex_aws,
  access_key_id: [System.get_env("AWS_ACCESS_KEY_ID"), :instance_role],
  secret_access_key: [System.get_env("AWS_SECRET_ACCESS_KEY"), :instance_role],
  region: System.get_env("AWS_S3_REGION")
  

# Config bucket policy
{
    "Version": "2008-10-17",
    "Id": "PolicyForCloudFrontPrivateContent",
    "Statement": [
        {
            "Sid": "1",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::cloudfront:user/CloudFront Origin Access Identity IDENTITY"
            },
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::BUCKET_NAME/*"
        },
        {
            "Sid": "Stmt1509416366444",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::IAM_USER"
            },
            "Action": "*",
            "Resource": "arn:aws:s3:::BUCKET_NAME/*"
        }
    ]
}