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Add the tool uncrustify to the debian:10 image

See merge request !82

Revert "Merge branch 'feature/add_scotch_par_metis_flags' into 'master'"

See merge request !81

Add clang-format tool to Dockerfile + some cleanup of the order of packages

See merge request !80

This reverts merge request !78

Enable scotch-metis and scotch-parmetis in cmake

See merge request docker/ci!78

add more python packages to ubuntu:20.04 docker image

See merge request docker/ci!77

add toolchains gcc-10-20 for ubuntu:20.04

See merge request docker/ci!76

Toolchains for clang-10-17 and clang-10-20 were swapped.

See merge request docker/ci!74

duneci-install-module: do not use feature branch logic for default branch

See merge request docker/ci!73

If you had a default branch "master" setting `DUNECI_BRANCH=xy`, then
one would get the "master" branch of dependencies installed via
`duneci-install-module` as they most likely have a branch with this
name. However we want to get the "xy" branch in this case.

This change disables the logic for the default branch, so one will get
"xy" as expected.

remove connection to mirror service since not reachable

See merge request docker/ci!72

deactivate gcc-10 c++20 toolchain from dune builds

See merge request docker/ci!71

remove clang-8 from debian-11 since not available in package repository

See merge request docker/ci!70

Add python3-ufl and petsc-dev to debian-{10,11} and ubuntu-20.04.

See merge request docker/ci!69

Merge branch 'no-pull' into 'master'

See merge request [docker/ci!68]

  [docker/ci!68]: Nonedocker/ci/merge_requests/68

Merge branch 'add-gcc-10' into 'master'

See merge request [docker/ci!67]

  [docker/ci!67]: Nonedocker/ci/merge_requests/67

Merge branch 'issue/clang-8-missing-in-debian-11' into 'master'

ref:docker/ci\>

### Summary

In debain-11 image there is a toolchain for clang-8 but no clang-8 compiler
installed. This is fixed by this MR.

### Discussion

An alternative fix could be to change the toolchain(s) to clang-9, since this
is also available in debian-11. I couldn't get both installed at the same
time, because of conflicts in the libc++-dev packages.

See merge request [docker/ci!63]

  [docker/ci!63]: gitlab.dune-project.org/docker/ci/merge_requests/63

Merge branch 'issue/toolchain-clang-vc' into 'master'

ref:docker/ci\>

### Summary

This MR workarounds a bug in clang that leads to a segfault in the compiler
when compiling with architecture flags like -mno-sse. See
[core/dune-istl#93],
[core/dune-common#132], [#9], and [!46]

### Details

The target architecture for detection of optimization flags is explicitly set
to none to prevent the Vc config package from adding those flags. This is done
for all toolchains involving clang-6 and clang-7 even those with noassert.

### Note

This change is necessary to build release 2.6 only. Maybe there is an
alternative check to guarantee that Vc package is new enough, instead of
having a fixed deactivation.

See merge request [docker/ci!62]

  [core/dune-istl#93]: core/dune-istl#93
  [core/dune-common#132]: core/dune-common#132
  [#9]: gitlab.dune-project.org/NoneNone/issues/9
  [!46]: gitlab.dune-project.org/NoneNone/merge_requests/46
  [docker/ci!62]: gitlab.dune-project.org/docker/ci/merge_requests/62

Merge branch 'feature/ubuntu-18.04-cmake-update' into 'master'

ref:docker/ci\>

### Summary

This MR adds a recent cmake version to the ubuntu 18.04 distribution.

### Details

Ubuntu 18.04 ships with cmake 3.10. For a development of a new build-system we
might need at least cmake 3.13. This MR updates the cmake version by adding a
kitware apt repository. This way we get cmake 3.17

See merge request [docker/ci!61]

  [docker/ci!61]: gitlab.dune-project.org/docker/ci/merge_requests/61

Merge branch 'feature/ubuntu-20.04' into 'master'

ref:docker/ci\>

### Summary

This MR adds another ubuntu distribution with more recent clang compiler and
other tool in newer versions

-   clang: 10.0
-   gcc: 9.3
-   cmake: 3.16.3

For each compiler we add two c++ standard version, c++17 and c++20 as
toolchain each with and without assert enabled. So, in total we have 8
toolchains:

-   gcc-9 (c++17, c++20, c++17-noassert, c++20-noassert)
-   clang-10 (c++17, c++20, c++17-noassert, c++20-noassert)

The dune-git images are now build with ubuntu-20.04 instead of ubuntu-18.04.
The reason is that we will need a more recent cmake version in the near
future.

See merge request [docker/ci!60]

  [docker/ci!60]: gitlab.dune-project.org/docker/ci/merge_requests/60