Check that CHAMELEON_Init() was successful in testing

Hello,

Everything is in the title of the MR / commit message.

You can test it with STARPU_NCPU=1 STARPU_MAIN_THREAD_BIND=1 mpirun ./chameleon_stesting -o potrf. Without my patch, StarPU fails silently in its initialization, but yells and aborts when the first task is submitted. The failure in StarPU initialization is "normal": STARPU_MAIN_THREAD_BIND=1 retrieves one core to the number of cores; and in this case, there is no remaining worker available to execute tasks.

Also I noticed function documentation is not consistent: https://gitlab.inria.fr/solverstack/chameleon/-/blob/master/include/chameleon/runtime.h#L117 says >0 on success to initialize the runtime, while https://gitlab.inria.fr/solverstack/chameleon/-/blob/master/control/control.c#L52 says @retval CHAMELEON_SUCCESS successful exit, it returns well CHAMELEON_SUCCESS in case of success, but CHAMELEON_SUCCESS is defined as 0, which is incoherent with the first comment (or the first comment is incorrect, I don't know ).

.gitlab/common.yml

@@ -6,18 +6,21 @@
   only:
     - master@solverstack/chameleon
     - /^ci-.*$/
+  except:
+    - schedules
 
 .only-branches:
   only:
-    - branches
+    - merge_requests
     - master@solverstack/chameleon
     - /^ci-.*$/
   except:
-    - master
     - schedules
 
 .build_script_template:
+  extends: .only-branches
   image: registry.gitlab.inria.fr/solverstack/docker/distrib
+  interruptible: true
   stage: build
   tags: ["linux"]
   script:
@@ -42,6 +45,7 @@
 
 .test_script_template:
   image: registry.gitlab.inria.fr/solverstack/docker/distrib
+  interruptible: true
   stage: test
   tags: ["linux"]
   script:
@@ -62,8 +66,6 @@
     - lcov --directory build-$VERSION --capture --output-file ./${LOGNAME}.lcov
     - (cd build-$VERSION && lcov --directory . --capture --output-file ../bis_${LOGNAME}.lcov)
     - xsltproc -o report.xml /home/gitlab/ctest-to-junit.xsl build-$VERSION/Testing/**/Test.xml
-  except:
-    - schedules
 
 .bench_plafrim_common:
   only: