[newlib-cygwin] Cygwin: CI: grant full control to Administrators on github workspace

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=17fe9b60f58d4b5bbb560d933503861e0de223d7

commit 17fe9b60f58d4b5bbb560d933503861e0de223d7
Author: Jeremy Drake <[email protected]>
Date:   Mon Jun 9 12:25:04 2025 -0700

    Cygwin: CI: grant full control to Administrators on github workspace
    
    After inherited permissons were removed, apparently there were no
    permissions left allowing access, and GHA recently started failing on
    actions/checkout with EPERM.
    
    Signed-off-by: Jeremy Drake <[email protected]>

Diff:
---
 .github/workflows/cygwin.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
index 087a68a99..3c3cd9321 100644
--- a/.github/workflows/cygwin.yml
+++ b/.github/workflows/cygwin.yml
@@ -107,7 +107,10 @@ jobs:
     - run: git config --global core.autocrlf input
     # remove inheritable permissions since they break assumptions testsuite
     # makes about file modes
-    - run: icacls . /inheritance:r
+    - name: adjust permissions
+      run: |
+        icacls . /inheritance:r
+        icacls . /grant Administrators:F
     - uses: actions/checkout@v3
 
     # install cygwin and build tools