Try using __w

.github/workflows/kani.yml

@@ -194,14 +194,17 @@ jobs:
       volumes:
         - /usr/local:/mnt/host-local
     steps:
+      - name: Remove unnecessary software to free up disk space
+        run: |
+          # inspired by https://github.com/easimon/maximize-build-space/blob/master/action.yml
+          df -h
+          rm -r /__w/usr/share/dotnet /__w/usr/local/lib/android /__w/usr/local/.ghcup
+          df -h
       # This is required before checkout because the container does not
       # have Git installed, so cannot run checkout action. The checkout
       # action requires Git >=2.18, so use the Git maintainers' PPA.
       - name: Install system dependencies
         run: |
-          df -h
-          rm -r /mnt/host-local/lib/android /mnt/host-local/.ghcup
-          df -h
           apt-get update
           apt-get install -y software-properties-common apt-utils
           add-apt-repository ppa:git-core/ppa