CI: try free up space in Rust / cargo test (amd64) action (apache#18709)

Closes apache#18692 (hopefully)

Trying to get CI to pass consistently, try various techniques.

Author: Jefffrey

.github/workflows/rust.yml

@@ -266,7 +266,21 @@ jobs:
     runs-on: ubuntu-latest
     container:
       image: amd64/rust
+      volumes:
+        - /usr/local:/host/usr/local
     steps:
+      - name: Remove unnecessary preinstalled software
+        run: |
+          echo "Disk space before cleanup:"
+          df -h
+          # remove tool cache: about 8.5GB (github has host /opt/hostedtoolcache mounted as /__t)
+          rm -rf /__t/* || true
+          # remove Haskell runtime: about 6.3GB (host /usr/local/.ghcup)
+          rm -rf /host/usr/local/.ghcup || true
+          # remove Android library: about 7.8GB (host /usr/local/lib/android)
+          rm -rf /host/usr/local/lib/android || true
+          echo "Disk space after cleanup:"
+          df -h
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8  # v5.0.0
         with:
           submodules: true