cleanup used space for GitHub Actions (for Integration) (#99)

This should fix the error "no space left on device: unknown", like there: https://github.com/storj/up/actions/runs/11377876547/job/31652725692

.github/workflows/build.yml

@@ -17,5 +17,10 @@ jobs:
         run: earthly --ci +test
       - name: Lint
         run: earthly --ci +lint
+      - name: Cleanup used space
+        uses: jlumbroso/free-disk-space@main
+        with:
+          tool-cache: false
+          docker-images: false
       - name: Integration
-        run: earthly -P --ci +integration-all
+        run: earthly -P --ci +integration-all