Remove executable flag from file mode (#6185)

* Remove executable flag from file mode

Affected: dgraph, django, homebrew, pagekit, uikit

* Add lint step to CI to reject executable icons

Co-authored-by: Eric Cornelissen <ericornelissen@gmail.com>

.github/workflows/verify.yml

@@ -44,6 +44,24 @@ jobs:
         run: npm ci
       - name: Run linter
         run: npm run lint
+      - name: Verify file permissions
+        run: |
+          CHECK_DIRS="icons/ _data/"
+          echo "Searching the following directories for executable files:"
+          echo "${CHECK_DIRS}"
+          echo ""
+          EXE_FILES=$(find ${CHECK_DIRS} -type f -executable)
+          if test -n "${EXE_FILES-}"
+          then
+            echo "Some files were detected to have their executable bit set."
+            echo "To fix this, you can use 'chmod -x PATH/TO/FILE' on the following files:"
+            echo ""
+            echo "${EXE_FILES}"
+            exit 1
+          else
+            echo "All clear."
+            exit 0
+          fi
   test:
     name: Test package
     runs-on: ubuntu-latest