fix the format workflow (hopefully)

Signed-off-by: ngn <ngn@ngn.tf>

.gitea/workflows/format.yml

@@ -18,6 +18,12 @@ jobs:
 
       - name: Install black formatter
         run: sudo apt install black
+        run: |
+          python3 -m venv venv
+          source venv/bin/activate
+          pip3 install black
 
       - name: Check formatting
-        run: make check
+        run: |
+          source venv/bin/activate
+          make check