wip: nixify

.github/workflows/build.yml

@@ -31,7 +31,7 @@ jobs:
           pwd          
           ls -la 
           docker ps -a
-          docker rm $(docker ps -aq)
+          docker rm $(docker ps -aq) || true
           mkdir test
           touch test/xxx
           docker run -v "$(pwd)/test:/test:z" --rm --entrypoint=/bin/bash -t ubuntu -c "ls -la /test"