Add a check for executables in /tmp

Yaknow, case we get owned

check_executables_in_tmp

@@ -0,0 +1,32 @@
+#! /bin/sh
+#
+# check_executables_in_tmpdir
+# Check a directory for executables and become angry if we find them
+#
+# Copyright (C) 2022 Jacob Babor <jacob@babor.tech>
+#
+# Distributed under terms of the MIT license.
+#
+
+set -e
+
+tmpdir="/tmp"
+
+# Compile a list of executables found in /tmp
+executables=""
+find "$tmpdir" -type f -executable 2>/dev/null | while read line; do
+	if [ -z "$executables" ]; then
+		executables="$line"
+	else
+		executables="$executables, $line"
+	fi
+done
+
+# If we found any, become angry
+if [ -n "$executables" ]; then
+	echo "CRITICAL: Found executables in $tmpdir: $executables"
+	exit 2
+else
+	echo "OK: No executables in $tmpdir"
+	exit 0
+fi