Fix shellcheck error

Author: aaemnnosttv

.github/workflows/build.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Get Composer Cache Directory
         id: composer-cache
-        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+        run: echo "dir=$(composer config cache-files-dir)" >> "$GITHUB_OUTPUT"
       - name: Cache PHP dependencies
         uses: actions/cache@v3
         id: actions-cache