clear up some space for docker ci

.github/workflows/docker-image.yml

@@ -12,4 +12,10 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag openfold:$(date +%s)
\ No newline at end of file
+      run: |
+        # Workaround to provide additional free space for testing.
+        #   https://github.com/actions/virtual-environments/issues/2840
+        sudo rm -rf /usr/share/dotnet
+        sudo rm -rf /opt/ghc
+        sudo rm -rf "/usr/local/share/boost" 
+        docker build . --file Dockerfile --tag openfold:$(date +%s)