adjust export-ignore checking in deleted files action

This makes use of git check-attr to properly check the attributes. The
attributes have been extended to match subdirs and files.

.gitattributes

@@ -8,6 +8,7 @@
 .git export-ignore
 .gitattributes export-ignore
 .github export-ignore
+.github/** export-ignore
 .gitignore export-ignore
 .editorconfig export-ignore
 .travis.yml export-ignore
@@ -15,5 +16,5 @@ appveyor.yml export-ignore
 composer.json export-ignore
 composer.lock export-ignore
 _test export-ignore
-_cs export-ignore
+_test/** export-ignore
 lib/plugins/testing export-ignore

.github/workflows/deletedFiles.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Update deleted files
         run: |
           for F in $(git diff origin/stable..HEAD --summary | awk '/^ delete/ && $4 !~ /^(VERSION)/ {print $4}'); do
-            if grep -q "^$F export-ignore" .gitattributes; then
+            if (git check-attr export-ignore "$F" | grep -q "export-ignore: set"); then
               continue
             fi
             if grep -q "^$F" data/deleted.files; then