CI: Free disk space for ROS2 example

.github/workflows/ci.yml

@@ -159,6 +159,24 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: r7kamura/rust-problem-matchers@v1.1.0
+
+      - name: Free Disk Space (Ubuntu)
+        uses: jlumbroso/free-disk-space@main
+        if: runner.os == 'Linux'
+        with:
+          # this might remove tools that are actually needed,
+          # if set to "true" but frees about 6 GB
+          tool-cache: false
+
+          # all of these default to true, but feel free to set to
+          # "false" if necessary for your workflow
+          android: true
+          dotnet: true
+          haskell: true
+          large-packages: false
+          docker-images: true
+          swap-storage: false
+
       - run: cargo --version --verbose
       - uses: Swatinem/rust-cache@v2
         with: