Add CI step that frees disk space on Linux.

It seems Cargo generates so much data that the CI will occasionally fail
due to running out of disk space. This change increases the available
disk space by 20GB.

.github/workflows/ci.yml

@@ -39,6 +39,22 @@ jobs:
       - name: Checkout Sources
         uses: actions/checkout@v2
 
+      - name: Free Disk Space
+        if: matrix.platform.name == 'Linux'
+        run: |
+            echo "Freeing up disk space on Linux CI"
+            df -h
+            sudo rm -rf /usr/share/dotnet/
+            sudo rm -rf /opt/ghc
+            sudo rm -rf /usr/local/share/boost
+            sudo rm -rf /usr/local/graalvm/
+            sudo rm -rf /usr/local/.ghcup/
+            sudo rm -rf /usr/local/share/powershell
+            sudo rm -rf /usr/local/share/chromium
+            sudo rm -rf /usr/local/lib/android
+            sudo rm -rf /usr/local/lib/node_modules
+            df -h
+
       - name: Install Native Dependencies (macOS)
         if: matrix.platform.name == 'macOS'
         run: |