ci: Remove tool cache to free disk space in runtime build

Author: openhands-agent

.github/workflows/build-runtime-image.yml

@@ -48,6 +48,9 @@ jobs:
           OH_RUNTIME_RUNTIME_IMAGE_REPO: ghcr.io/remind101/runtime # This might not be strictly necessary as build.sh constructs the final path
 
 
+      - name: Free up disk space by removing tool cache
+        run: sudo rm -rf /opt/hostedtoolcache
+
       - name: Build and Push Runtime Image
         run: |
           echo "Building runtime image with tag stable-with-patches and source tag..."