Add 'sa-east-1' region to endpoints configuration for Firehose

[st3llaris]

Fixes the error firehose not supported in region sa-east-1 for partition aws

** (RuntimeError) firehose not supported in region sa-east-1 for partition aws
    (ex_aws 2.6.0) lib/ex_aws/config/defaults.ex:206: ExAws.Config.Defaults.fetch_or/3
    (ex_aws 2.6.0) lib/ex_aws/config/defaults.ex:189: ExAws.Config.Defaults.do_host/3
    (ex_aws 2.6.0) lib/ex_aws/config/defaults.ex:120: ExAws.Config.Defaults.get/2
    (ex_aws 2.6.0) lib/ex_aws/config.ex:102: ExAws.Config.build_base/2
    (ex_aws 2.6.0) lib/ex_aws/config.ex:75: ExAws.Config.new/2
    (ex_aws 2.6.0) lib/ex_aws.ex:73: ExAws.request/2

While this is not yet merged and you are having this issue right now, I wrote a script that manually patches it:

#!/bin/bash
# Script to patch ex_aws endpoints.exs to add sa-east-1 support for Firehose

ENDPOINTS_FILE="deps/ex_aws/priv/endpoints.exs"

if [ ! -f "$ENDPOINTS_FILE" ]; then
  echo "Error: $ENDPOINTS_FILE not found. Run 'mix deps.get' first."
  exit 1
fi

if grep -A 15 '"firehose" => %{' "$ENDPOINTS_FILE" | grep -q '"sa-east-1" => %{}'; then
  echo "Patch already applied to $ENDPOINTS_FILE"
  exit 0
fi

sed -i.bak '/"me-central-1" => %{},/a\
            "sa-east-1" => %{},' "$ENDPOINTS_FILE"

if [ $? -eq 0 ]; then
  echo "Successfully patched $ENDPOINTS_FILE to add sa-east-1 support for Firehose"
  rm -f "$ENDPOINTS_FILE.bak"
else
  echo "Error: Failed to patch $ENDPOINTS_FILE"
  exit 1
fi

Run:

mix deps.get
chmod +x patch_ex_aws_endpoints.sh
./patch_ex_aws_endpoints.sh