Revert "Add s3-publishing script."

This reverts commit 98f06c9af6.

ci/publish-s3

@@ -1,13 +0,0 @@
-#!/bin/bash
-
-SHA=$(git rev-parse --short HEAD)
-BRANCH=$(git branch --no-color 2>/dev/null | grep '^*' | colrm 1 2)
-BUCKET=download.elasticsearch.org
-KEYPRE=elasticsearch/elasticsearch
-
-for src in target/releases/elasticsearch-*.{deb,tar.gz,zip}; do
-  f=$(echo $src | perl -pe "s,(elasticsearch)-.*?\.(tar.gz|zip|deb)\$,\$1-$BRANCH.\$2,")
-  cmd="s3cmd put $src s3://$BUCKET/$KEYPRE/$(basename $f)"
-  echo $cmd
-  $cmd
-done