Remove checkout@v6 includeIf credential entries before release push

Author: arcivanov

action.yml

@@ -264,8 +264,12 @@ runs:
 
         git config user.name "github-actions[bot]"
         git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
-        # Remove checkout's credential helper so the app token in the URL is used
+        # Remove checkout's credential helpers so the app token in the URL is used
         git config --unset-all http.https://github.com/.extraheader || true
+        # checkout@v6 uses includeIf.gitdir entries pointing to credential files
+        git config --local --get-regexp 'includeIf\..*\.path' | while read key value; do
+          git config --local --unset "$key" || true
+        done
         git remote set-url origin "https://x-access-token:${GH_TOKEN}@github.com/${{ github.repository }}.git"
         # Unshallow if needed — shallow clones can cause push failures
         if [ -f "$(git rev-parse --git-dir)/shallow" ]; then