CI: travis: add yq installer script

We need to have `yq` installed before we can 'make', as we
now use it for a version check in the build. But, we may not
have golang installed. Add a script that installs `yq` via
curl'ing from the github releases.
This was cloned from the function in the tests repo .ci scripts
that perform the same action.

Signed-off-by: Graham Whaley <graham.whaley@intel.com>

.ci/install-yq.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2018 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+# If we fail for any reason a message will be displayed
+die() {
+	msg="$*"
+	echo "ERROR: $msg" >&2
+	exit 1
+}
+
+# Install the yq yaml query package from the mikefarah github repo
+# Install via binary download, as we may not have golang installed at this point
+function install_yq() {
+	GOPATH=${GOPATH:-${HOME}/go}
+	local yq_path="${GOPATH}/bin/yq"
+	local yq_pkg="github.com/mikefarah/yq"
+	[ -x  "${GOPATH}/bin/yq" ] && return
+
+	read -r -a sysInfo <<< "$(uname -sm)"
+
+	case "${sysInfo[0]}" in
+	"Linux" | "Darwin")
+		goos="${sysInfo[0],}"
+		;;
+	"*")
+		die "OS ${sysInfo[0]} not supported"
+		;;
+	esac
+
+	case "${sysInfo[1]}" in
+	"aarch64")
+		goarch=arm64
+		;;
+	"ppc64le")
+		goarch=ppc64le
+		;;
+	"x86_64")
+		goarch=amd64
+		;;
+	"s390x")
+		goarch=s390x
+		;;
+	"*")
+		die "Arch ${sysInfo[1]} not supported"
+		;;
+	esac
+
+	mkdir -p "${GOPATH}/bin"
+
+	# Workaround to get latest release from github (to not use github token).
+	# Get the redirection to latest release on github.
+	yq_latest_url=$(curl -Ls -o /dev/null -w %{url_effective} "https://${yq_pkg}/releases/latest")
+	# The redirected url should include the latest release version
+	# https://github.com/mikefarah/yq/releases/tag/<VERSION-HERE>
+	yq_version=$(basename "${yq_latest_url}")
+
+	local yq_url="https://${yq_pkg}/releases/download/${yq_version}/yq_${goos}_${goarch}"
+	curl -o "${yq_path}" -L ${yq_url}
+	chmod +x ${yq_path}
+
+	if ! command -v "${yq_path}" >/dev/null; then
+		die "Cannot not get ${yq_path} executable"
+	fi
+}
+
+install_yq