Improve infra-run portfolio credibility

infra-run/scripts/bash/os-healthcheck/disk_check.sh

@@ -1,7 +1,5 @@
 #!/usr/bin/env bash
-set -o errexit
-set -o nounset
-set -o pipefail
+set -euo pipefail
 
 threshold="${1:-80}"
 
@@ -13,7 +11,7 @@ fi
 status=0
 warning_threshold=$(( threshold > 5 ? threshold - 5 : threshold ))
 
-while read -r filesystem size used avail use_percent mountpoint; do
+while read -r filesystem _size _used avail use_percent mountpoint; do
   usage="${use_percent%\%}"
 
   if (( usage >= threshold )); then