Update .gitlab-ci.yml file

4 jobs for master in 52 seconds (queued for 8 seconds)
Name Stage Failure
failed
build-libs Build
  COMPILE FPIC       tracefs-filter.o
bison --debug -v --report-file=bison.report -d -o sqlhist.tab.c sqlhist.y
flex -o sqlhist-lex.c sqlhist.l
make[1]: flex: No such file or directory
make[1]: *** [Makefile:46: sqlhist-lex.c] Error 127
make: *** [Makefile:361: /builds/perronet/rbf-trace/src/events_generation/binary_parser/lib/libtracefs/lib/tracefs/libtracefs.a] Error 2
Build error in libtracefs.
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1