Add gcloud installation script

scripts/install-gcloud

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -xeuo pipefail
+
+export DEBIAN_FRONTEND=noninteractive
+
+GCLOUD_VERSION=${1}
+
+apt-get update
+apt-get -y install \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    python3 \
+    gnupg
+
+curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
+echo "deb https://packages.cloud.google.com/apt cloud-sdk main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
+
+apt-get update
+
+PACKAGE_VERSION=$(apt-cache policy google-cloud-cli | awk -v dv=${GCLOUD_VERSION} '$1 ~ dv {print $1}')
+
+apt-get install -y google-cloud-cli=${PACKAGE_VERSION}
+apt-get -yq autoremove
+apt-get clean -yqq
+rm -rf /var/lib/apt/lists/*