use -exec action instead of -executable test for find (#461)

Author: M-Enes

.github/workflows/scripts/run_tests.sh

@@ -3,8 +3,8 @@
 # Fail on failing QTest execution
 set -e
 
-find . -executable -type f -name "tst_*" | while read line; do
+find . -type f -name "tst_*" -exec test -x {} \; -print | while read line; do
     echo "Running unit test: "
     echo "${line}"
     ($line)
-done
+done