ci: add the sweeper in a different job (scaleway#4387)

Author: remyleone

.github/workflows/nightly.yml

@@ -86,6 +86,19 @@ jobs:
         env:
           SLACK_WEBHOOK_NIGHTLY: ${{ secrets.SLACK_WEBHOOK_NIGHTLY }}
           FAILED_PRODUCT: ${{ matrix.products }}
+
+  sweepers:
+    runs-on: ubuntu-latest
+    needs: nightly
+    if: always()
+    steps:
+      # Checkout should always be before setup-go to ensure caching is working
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: 1.22
       - name: Run Sweepers
         run: go run -v ./cmd/scw-sweeper
         env: