Update compiler toolchains in the core pipeline

See merge request !11

Merge branch 'core' of ssh://gitlab.dune-project.org:22022/infrastructure/dune-nightly-test into core

Update compilers in core pipeline

See merge request !7

replaced ubuntu 20 with 18 image on which the python build is known to fail. This is to test that the system continues without flagging a failure

added a debian:10 image to the CI on which the python build is known to fail. This is to test that the system continues without flagging a failure

test python support

See merge request !5

[testing] make CI pass by disabling a toolchain for which numpy download fails

[testing] need DUNE_RUNNING_IN_CI flag

enable same toolchains as in master

need to use shared libs with clang for python bindings

try if shared libs can be avoided

turn on shared libs for all runs

turn CMAKE_INSTALL_RPATH_USE_LINK_PATH on

[bugfix][alugrid] Allow debian:10 to fail.

use the different images/toolchains to test different configurations of builddir location and python bindings

try the full set of toolchains with python bindings setup

improve taging in gitlab-ci.yml file

set number of ninja processors

See merge request !4

Retry failed jobs

See merge request !3