Free disk space in CI before installing dependencies

Remove preinstalled .NET, Android SDK, GHC, and CodeQL to reclaim ~15GB
for tensorflow + sam2 installation.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: zsylvester

.github/workflows/ci.yaml

@@ -15,6 +15,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+    - name: Free disk space
+      run: |
+        sudo rm -rf /usr/share/dotnet
+        sudo rm -rf /usr/local/lib/android
+        sudo rm -rf /opt/ghc
+        sudo rm -rf /opt/hostedtoolcache/CodeQL
     - uses: actions/checkout@v4
     - name: Set up Python 3.10
       uses: actions/setup-python@v5