fix: detect package installed, pipefail friendly

Author: tomashley

ansible/files/admin_api_scripts/pg_upgrade_scripts/initiate.sh

@@ -353,11 +353,11 @@ function initiate_upgrade {
         # lsb release
         UBUNTU_VERSION=$(lsb_release -rs)
         # install amazon disk utilities if not present on 24.04
-        if [ "${UBUNTU_VERSION}" = "24.04" ] && ! dpkg -l | grep -q amazon-ec2-utils; then
+        if [ "${UBUNTU_VERSION}" = "24.04" ] && ! /usr/bin/dpkg-query -W amazon-ec2-utils >/dev/null 2>&1; then
             apt-get update
             apt-get install -y amazon-ec2-utils || true
         fi
-        if command -v ebsnvme-id >/dev/null 2>&1 && dpkg -l | grep -q amazon-ec2-utils; then
+        if command -v ebsnvme-id >/dev/null 2>&1 && /usr/bin/dpkg-query -W amazon-ec2-utils >/dev/null 2>&1; then
             for nvme_dev in $(lsblk -dprno name,size,mountpoint,type | grep disk | awk '{print $1}'); do
                 if [ -b "$nvme_dev" ]; then
                     mapping=$(ebsnvme-id -b "$nvme_dev" 2>/dev/null)