[CI] install flash-attn 2.7.4.post1

Author: botbw

.github/workflows/build_on_schedule.yml

@@ -3,7 +3,7 @@ name: Build on Schedule
 on:
   schedule:
     # run at 00:00 of every Sunday
-    - cron: "0 0 * * *"
+    - cron: "0 0 * * 0"
   workflow_dispatch:
 
 jobs:
@@ -51,6 +51,10 @@ jobs:
         with:
           ssh-key: ${{ secrets.SSH_KEY_FOR_CI }}
 
+      - name: Install flash-attention
+        run: |
+          pip install flash-attn==2.7.4.post1 --no-build-isolation
+
       - name: Install Colossal-AI
         if: steps.check-avai.outputs.avai == 'true'
         run: |