disable debug assertions to speed up the check-aux job

Author: RalfJung

src/ci/docker/host-x86_64/x86_64-gnu-aux/Dockerfile

@@ -25,5 +25,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
+# Miri is just too slow with full assertions
+ENV NO_DEBUG_ASSERTIONS=1
+ENV NO_OVERFLOW_CHECKS=1
+
 ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu
 ENV RUST_CHECK_TARGET check-aux