chore: spack-0.20.0

containers/jug/dev.Dockerfile

@@ -64,7 +64,7 @@ RUN declare -A target=(                                                 \
 ## Setup spack buildcache mirrors
 RUN --mount=type=cache,target=/var/cache/spack-mirror                   \
     spack mirror add spack-mirror /var/cache/spack-mirror               \
- && spack buildcache update-index -m spack-mirror                       \
+ && spack buildcache update-index spack-mirror                          \
  && spack mirror list
 
 ## Setup eic-spack buildcache mirrors