fix: put back the test/skeleton/ring.dot file (break the tuto)

5 jobs for master in 3 minutes and 57 seconds (queued for 6 seconds)
Status Name Job ID Coverage
  Build
failed build #260810

00:03:57

 
  Release
skipped release #260813
skipped simca-docker #260811
skipped test_opam_test #260812
allowed to fail
 
  Deploy
skipped pages #260814
 
Name Stage Failure
failed
build Build
(cd _build/default && /home/opam/.opam/4.13/bin/ocamlc.opt -w @1..3@5..28@30..39@43@46..47@49..57@61..62-40 -strict-sequence -strict-formats -short-paths -keep-locs -g -bin-annot -I lib/sasacore/.sasacore.objs/byte -I /home/opam/.opam/4.13/lib/lutils -I /home/opam/.opam/4.13/lib/num -I /home/opam/.opam/4.13/lib/ocamlgraph -I /home/opam/.opam/4.13/lib/stdlib-shims -no-alias-deps -opaque -open Sasacore -o lib/sasacore/.sasacore.objs/byte/sasacore__WorstInit.cmo -c -impl lib/sasacore/worstInit.ml)
File "lib/sasacore/worstInit.ml", line 6, characters 13-16:
6 | type point = num Array.t
^^^
Error: Unbound type constructor num
Makefile.sasa:4: recipe for target 'build' failed
make: *** [build] Error 1
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1