Update .gitlab-ci.yml file

add branch main_rc

.gitlab-ci.yml

@@ -36,7 +36,7 @@ build_experimental:
     - make units 2>&1 |tee scalfmm-exp-units-build.log
   only:
     - experimental
-    - fix/3.0/openmp
+    - main_rc
 
 test_experimental:
   stage: test_experimental
@@ -52,4 +52,4 @@ test_experimental:
     - (cd build_exp && OMP_NUM_THREADS=8 ctest --no-compress-output -VV -j 8
          -I 16,19,1 --repeat until-fail:10 --output-on-failure --stop-on-failure)
   only:
-    - fix/3.0/openmp
+    - main_rc