Hide the Makefile.version file so that the opam package does not depend on git to compile

Add a CI pipeline
2 jobs for master in 1 minute and 14 seconds
Status Name Job ID Coverage
  Build
failed build_and_test #4940

00:01:14

 
  Test
skipped test_opam_test #4941
 
Name Stage Failure
failed
build_and_test Build There is an unknown failure, please try again
Try 'dirname --help' for more information.
ocamlfind: Package `camlidl' not found
ocamlfind: Package `camlidl' not found
ocamlfind: Package `camlidl' not found
oasis setup
make: oasis: Command not found
Makefile:39: recipe for target 'setup.ml' failed
make: *** [setup.ml] Error 127
ERROR: Job failed: exit code 1