Add a script to upload nightly packages to S3

etc/ci/upload_nightly.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+shopt -s failglob
+
+
+usage() {
+    printf "usage: ${0} android|linux|mac|windows\n"
+}
+
+
+upload() {
+    s3cmd put "${2}" "s3://servo-developer-preview/nightly/${1}"
+}
+
+
+main() {
+    if [[ "$#" != 1 ]]; then
+        usage >&2
+        return 1
+    fi
+
+    local platform package
+    platform="${1}"
+
+    if [[ "${platform}" == "android" ]]; then
+        package=target/arm-linux-androideabi/release/*.apk
+    elif [[ "${platform}" == "linux" ]]; then
+        package=target/*.tar.gz
+    elif [[ "${platform}" == "mac" ]]; then
+        package=target/*.dmg
+    elif [[ "${platform}" == "windows" ]]; then
+        package=target/*.tar.gz
+    else
+        usage >&2
+        return 1
+    fi
+
+    # Lack of quotes on package allows glob expansion
+    # Note that this is not robust in the case of embedded spaces
+    # TODO(aneeshusa): make this glob robust using e.g. arrays or Python
+    upload "${platform}" ${package}
+}
+
+main "$@"