Don't use sudo -E flag in BuildKite.

This causes the $HOME env var to be preserved and then root user ends up
creating $HOME/.cache/bazel and things cascade downwards from there as the
gvisor-bazel container keeps crashing.

PiperOrigin-RevId: 532588412

.buildkite/pipeline.yaml

@@ -402,7 +402,7 @@ steps:
     label: ":podman: Podman"
     commands:
       - sudo ./test/podman/run.sh
-      - sudo -E RUNTIME_ARGS=--directfs ./test/podman/run.sh
+      - sudo RUNTIME_ARGS=--directfs ./test/podman/run.sh
     agents:
       <<: *ubuntu_agents
       cgroup: "v2"