Fix build jobs to 2

utils/ci/scripts/30_build.sh

@@ -17,12 +17,4 @@
 MYDIR="$(dirname "$(readlink -f $0)")"
 cd "$MYDIR/../../../../build" || exit 1
 
-if hash nproc 2>/dev/null; then
-  # calculation is kept for reference
-  MAKE_JOB_COUNT=$(($(nproc)/1))
-else
-  # fallback, if nproc doesn't exist
-  MAKE_JOB_COUNT=2
-fi
-
-make -j$MAKE_JOB_COUNT install
\ No newline at end of file
+make -j2 install
\ No newline at end of file