fix correct build location

.gitea/workflows/build.yaml

@@ -10,7 +10,10 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        run: |
+          cd /opt/mitm-webserver
+          git reset --hard origin/main
+          git pull
 
       - name: Build Frontend
         run: |