Revert "Don't run "opam clean -c" to workaround ocaml/opam#3828"

This reverts commit a03e0cb0ff40afabcaccba7f764076355ca82962.

1 files changed, 1 insertions, 1 deletions

diff --git a/Dockerfile b/Dockerfile
index eddbb0f..74ee396 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,7 +29,7 @@ RUN ["/bin/bash", "--login", "-c", "set -x \
   && opam pin add -n -k path coq-mathcomp-field . \
   && opam pin add -n -k path coq-mathcomp-character . \
   && opam install -y -v -j ${NJOBS} coq-mathcomp-character \
-  && opam clean -a -s --logs"]
+  && opam clean -a -c -s --logs"]
 
 FROM coqorg/base:bare