Set cgit agefile using latest commit authordate on any ref

Author: jb3

ansible/roles/git-mirrors/templates/update-mirrors.sh.j2

@@ -17,5 +17,13 @@ for repo in $FOUND_REPOS; do
     fi
     echo "Updated repository."
 
+    mkdir -p "info/web" || { echo "Error: Failed to create info/web directory in $repo"; exit 1; }
+
+    git for-each-ref \
+        --sort=-authordate --count=1 \
+        --format='%(authordate:iso8601)' \
+        --exclude='refs/pull/*/merge' \
+        > info/web/last-modified || { echo "Error: Failed to write last-modified file in $repo"; exit 1; }
+
     cd -
 done