use the dune docker registry for the python and 'with-checking' ci test

.gitlab-ci.yml

@@ -20,7 +20,7 @@ variables:
   OMP_NUM_THREADS: 1
 
 debian-11-gcc-9-17-python:
-  image: duneci/debian:11
+  image: registry.dune-project.org/docker/ci/debian:11
   script: duneci-standard-test
   variables:
     DUNECI_TOOLCHAIN:   gcc-9-17
@@ -31,7 +31,7 @@ debian-11-gcc-9-17-python:
     DUNE_PY_DIR:        /duneci/modules/dune-py
     # during dune-py build this variable is used - do know a way to access
     # the CMAKE_FLAGS used to build the modules...
-    DUNE_CMAKE_FLAGS:   "CC=gcc-9 CXX=g++-9 -DCMAKE_CXX_FLAGS='-std=c++17 -O2 -g -Wall -fdiagnostics-color=always' -DDUNE_ENABLE_PYTHONBINDINGS=ON -DDUNE_MAX_TEST_CORES=4 -DBUILD_SHARED_LIBS=TRUE -DDUNE_PYTHON_INSTALL_LOCATION=none -DCMAKE_POSITION_INDEPENDENT_CODE=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_LATEX=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Alberta=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Vc=TRUE -DCMAKE_DISABLE_DOCUMENTATION=TRUE"
+    DUNE_CMAKE_FLAGS:   "-DCMAKE_CXX_COMPILER=g++-9 -DCMAKE_C_COMPILER=gcc-9 -DCMAKE_CXX_FLAGS='-std=c++17 -O2 -g -Wall -fdiagnostics-color=always' -DDUNE_ENABLE_PYTHONBINDINGS=ON -DDUNE_MAX_TEST_CORES=4 -DBUILD_SHARED_LIBS=TRUE -DDUNE_PYTHON_INSTALL_LOCATION=none -DCMAKE_POSITION_INDEPENDENT_CODE=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_LATEX=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Alberta=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Vc=TRUE -DCMAKE_DISABLE_DOCUMENTATION=TRUE"
     # cmake flags we use for all dune moudle - important is that build shared libs is set (need some better way of doing this)
     DUNECI_CMAKE_FLAGS: $DUNE_CMAKE_FLAGS
     # finally set the python path to all modules
@@ -39,7 +39,7 @@ debian-11-gcc-9-17-python:
   tags: [duneci]
 
 debian-11-gcc-9-17-with-checking:
-  image: duneci/debian:11
+  image: registry.dune-project.org/docker/ci/debian:11
   script: duneci-standard-test
   variables:
     DUNECI_TOOLCHAIN:   gcc-9-17