CI: fix release script

Author: CarterLi

.github/workflows/ci.yml

@@ -64,6 +64,8 @@ jobs:
     permissions:
       security-events: write
       contents: read
+    outputs:
+      ffversion: ${{ steps.ffversion.outputs.ffversion }}
     steps:
       - name: checkout repository
         uses: actions/checkout@v4
@@ -111,6 +113,10 @@ jobs:
       - name: run tests
         run: ctest
 
+      - name: get fastfetch version
+        id: ffversion
+        run: echo "ffversion=$(./fastfetch --version-raw)" >> $GITHUB_OUTPUT
+
       - name: upload artifacts
         uses: actions/upload-artifact@v4
         with: