CI: add Ubuntu 23.04 jobs

In contrast to the existing Ubuntu CI jobs, the Docker file introduced in this
commit ignores requirements.txt and doc/infosrc/requirements.txt and installs
the one Python package it needs, Pytest, from the native operating system
repositories. Debian and Ubuntu have adopted a policy change that has come into
effect in Ubuntu 23.04 that prevents Pip from installing package requirements
that conflict with system packages.¹ To work around this, we use the native
package manager instead.

The main effect of this is that CI jobs running this image do not have the
precise version of Pytest from requirements.txt. At time of writing, Pytest
7.2.1 is installed. As Graphviz’ use of Pytest is fairly basic and standard,
hopefully this will not cause problems.

An alternative would be to follow the path the policy is intended to push users
towards: creating a Python virtual environment. But this seems onerous to do for
Graphviz, something that is not a Python project, just to get testing machinery
functional.

Gitlab: closes #2382

¹ https://peps.python.org/pep-0668/
  This Github thread explains the actual observed effect and what is going on,
  python/cpython#102134 (comment).

.gitlab-ci.yml

@@ -393,6 +393,18 @@ ubuntu-22.10-build:
     variables:
       IMAGE: ubuntu-22.10
 
+ubuntu-23.04-build:
+    <<: *deb_build_definition
+    needs:
+        - job: docker_build_ubuntu-23.04
+          artifacts: false
+        - job: portable-source
+          artifacts: true
+    tags:
+        - linux
+    variables:
+      IMAGE: ubuntu-23.04
+
 out-of-source-build:
     <<: *deb_build_definition
     script:
@@ -753,6 +765,23 @@ ubuntu-22.10-cmake-build:
     variables:
       IMAGE: ubuntu-22.10
 
+ubuntu-23.04-cmake-build:
+    <<: *deb_build_definition
+    needs:
+        - job: docker_build_ubuntu-23.04
+          artifacts: false
+    before_script:
+        - export build_system="cmake"
+        # fail on any compiler warnings
+        - export CFLAGS=-Werror
+        - export CXXFLAGS=-Werror
+        - export CMAKE_OPTIONS="-Dwith_cxx_tests=ON -Dwith_cxx_api=ON"
+        - export CMAKE_OPTIONS="$CMAKE_OPTIONS -Dwith_smyrna=ON"
+    tags:
+        - linux
+    variables:
+      IMAGE: ubuntu-23.04
+
 ubuntu-22.04-cmake-minimal-build:
     <<: *deb_build_definition
     needs:
@@ -1088,6 +1117,18 @@ ubuntu-22.10-test:
     variables:
       IMAGE: ubuntu-22.10
 
+ubuntu-23.04-test:
+    <<: *linux_test_definition
+    before_script:
+        - export build_system="autotools"
+    needs:
+        - job: "ubuntu-23.04-build"
+          artifacts: true
+    tags:
+        - linux
+    variables:
+      IMAGE: ubuntu-23.04
+
 centos7-test:
     <<: *linux_test_definition
     before_script:
@@ -1209,6 +1250,19 @@ ubuntu-22.10-cmake-test:
     variables:
       IMAGE: ubuntu-22.10
 
+ubuntu-23.04-cmake-test:
+    <<: *linux_test_definition
+    before_script:
+        - export build_system="cmake"
+        - python3 gen_version.py --output GRAPHVIZ_VERSION
+    needs:
+        - job: "ubuntu-23.04-cmake-build"
+          artifacts: true
+    tags:
+        - linux
+    variables:
+      IMAGE: ubuntu-23.04
+
 ubuntu-22.10-cmake-ASan-test-including-ctest:
     <<: *linux_test_definition_including_ctest
     before_script:
@@ -1456,6 +1510,11 @@ docker_build_ubuntu-22.10:
   variables:
     IMAGE: ubuntu-22.10
 
+docker_build_ubuntu-23.04:
+  <<: *docker_build_definition
+  variables:
+    IMAGE: ubuntu-23.04
+
 docker_push_centos7:
   <<: *docker_push_definition
   variables:
@@ -1512,6 +1571,13 @@ docker_push_ubuntu-22.10:
   needs:
     - docker_build_ubuntu-22.10
 
+docker_push_ubuntu-23.04:
+  <<: *docker_push_definition
+  variables:
+    IMAGE: ubuntu-23.04
+  needs:
+    - docker_build_ubuntu-23.04
+
 lint_clang_format:
   image: "$CI_REGISTRY_IMAGE/ubuntu-22.10:$CI_COMMIT_SHA"
   stage: test

ci/ubuntu-23.04/Dockerfile

@@ -0,0 +1,91 @@
+FROM ubuntu:23.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update -y \
+&& apt-get install --no-install-recommends -y \
+# Development tools
+build-essential \
+clang-format \
+cmake \
+git \
+pkg-config \
+autoconf \
+bison \
+libtool \
+dh-python \
+flex \
+ksh \
+# Debian build utilities
+quilt \
+d-shlibs \
+debhelper \
+fakeroot \
+# Option glut
+freeglut3-dev \
+# Option gts
+libgts-dev \
+# Option swig
+swig \
+# Command smyra
+libgtkglext1-dev \
+libglade2-dev \
+# Command gvedit
+libqt5gui5 \
+qt5-qmake \
+qtbase5-dev \
+# for libmingle
+libann-dev \
+# Plugin library devil
+libdevil-dev \
+# Plugin library gd
+libgd-dev \
+# Documentation
+ghostscript \
+# Plugin library ghostscipt
+libgs-dev \
+# Plugin library lasi
+liblasi-dev \
+# Plugin library poppler
+libpoppler-dev \
+libpoppler-glib-dev \
+# Plugin library rsvg
+librsvg2-dev \
+# Plugin library webp
+libwebp-dev \
+# Language extension gv_sharp & gv_ruby
+ruby \
+# Language extension gv_go
+golang-go \
+# Language extension gv_guile
+guile-2.2 \
+guile-2.2-dev \
+# Language extension gv_lua
+lua5.3 \
+liblua5.3-dev \
+# Language extension gv_ocaml
+ocaml \
+# Language extension gv_perl
+libperl-dev \
+# Language extension gv_php
+php-dev \
+libsodium-dev \
+libargon2-0-dev \
+# Language extension gv_python3
+libpython3-dev \
+# Language extension gv_ruby
+ruby-dev \
+# Language extension gv_tcl
+tcl-dev \
+# Test utilities
+python3-pytest \
+python3-setuptools \
+gcovr \
+lcov \
+# Libraries used in test
+catch2 \
+libboost-dev \
+libfmt-dev \
+libsvgpp-dev \
+# Clean up
+&& rm -rf /var/lib/apt/lists/*