Remove unnecessary chmod command in CI (#734)

* Move optional steps for testing VMs out of README.md file
This may help avoid new users being confused that they must follow
those instructions.

Signed-off-by: Andy Fingerhut <andy_fingerhut@alum.wustl.edu>

* Add 2025-Jan-30 versions of source code for install.sh

Signed-off-by: Andy Fingerhut <andy_fingerhut@alum.wustl.edu>

* Remove unnecessary chmod command in CI

Signed-off-by: Andy Fingerhut <andy_fingerhut@alum.wustl.edu>

---------

Signed-off-by: Andy Fingerhut <andy_fingerhut@alum.wustl.edu>

Author: jafingerhut

.github/workflows/test-exercises.yml

@@ -34,7 +34,6 @@ jobs:
 
       - name: Run PTF Tests
         run: |
-          chmod +x exercises/${{ matrix.exercise }}/runptf.sh
           cd exercises/${{ matrix.exercise }}
           make test
         # Retain logs in case runs fail