Add script for uploading packages easier.

There is no way to say "for all debian and ubuntu dists, use this", so
we must upload the same files to all platforms we care about.

upload-packages

+#!/bin/bash
+#
+# Upload packages to packagecloud.io.
+
+REPO="lkarsten/varnish41"   # For now.
+
+if [ -z "$*" ]; then
+	echo "Usage: $0 deb|el6|el7 package1 [packageN..]"
+	exit 1
+fi
+
+if [ $1 == "deb" ]; then
+	package_cloud push $REPO/debian/jessie  $*
+	package_cloud push $REPO/debian/stretch $*
+
+	package_cloud push $REPO/ubuntu/trusty $*
+	package_cloud push $REPO/ubuntu/xenial $*
+elif [ $1 == "el6" ]; then
+	package_cloud push $REPO/el/6 $*
+elif [ $1 == "el7" ]; then
+	package_cloud push $REPO/el/7 $*
+else
+	echo "ERROR: Unknown mode $1"
+	exit 2
+fi