Switch the project from 0xacab to github

While the folks running 0xacab are much more lovely than the github ones, this
project has outgrown the former:

- Github offers beefy continuous integration, make it easier to run the
  testsuite on every python version, instead of using a weird docker-based
  contraption. Moreover, I'd rather burn some Microsoft money than 0xacab one.
- Opening an account on 0xacab is non-trivial (by design), making it tedious
  for people to report issues and contribute to mat2.
- Gitlab is becoming unbearably slow and convoluted, even compared to Github's
  awful Copilot/AI push.

It's a sad state of affairs, but it's a pragmatic decision. People who don't
have a Github account can still report issues and send patches by sending me an
email.

1 files changed, 0 insertions, 109 deletions

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
deleted file mode 100644
index c3b78a0..0000000
--- a/.gitlab-ci.yml
+++ /dev/null
@@ -1,109 +0,0 @@
-variables:
-  CONTAINER_REGISTRY: $CI_REGISTRY/georg/mat2-ci-images
-  GIT_DEPTH: "5"
-  GIT_STRATEGY: clone
-
-stages:
-  - linting
-  - test
-
-.prepare_env: &prepare_env
-  before_script:  # This is needed to not run the testsuite as root
-    - useradd --home-dir ${CI_PROJECT_DIR} mat2
-    - chown -R mat2 .
-  
-linting:ruff:
-  image: $CONTAINER_REGISTRY:linting
-  stage: linting
-  script:
-    - apt update
-    - apt install -qqy --no-install-recommends python3-venv
-    - python3 -m venv venv
-    - source venv/bin/activate
-    - pip3 install ruff
-    - ruff check .
-
-tests:archlinux:
-  image: $CONTAINER_REGISTRY:archlinux
-  stage: test
-  script:
-    - python3 -m unittest discover -v
-  
-tests:debian:
-  image: $CONTAINER_REGISTRY:debian
-  stage: test
-  <<: *prepare_env
-  script:
-    - apt-get -qqy purge bubblewrap
-    - su - mat2 -c "python3-coverage run --branch -m unittest discover -s tests/"
-    - su - mat2 -c "python3-coverage report --fail-under=95 -m --include 'libmat2/*'"
-
-tests:debian_with_bubblewrap:
-  image: $CONTAINER_REGISTRY:debian
-  stage: test
-  allow_failure: true
-  <<: *prepare_env
-  script:
-    - apt-get -qqy install bubblewrap
-    - python3 -m unittest discover -v
-
-tests:fedora:
-  image: $CONTAINER_REGISTRY:fedora
-  stage: test
-  script:
-    - python3 -m unittest discover -v
-
-tests:gentoo:
-  image: $CONTAINER_REGISTRY:gentoo
-  stage: test
-  <<: *prepare_env
-  script:
-    - su - mat2 -c "python3 -m unittest discover -v"
-
-tests:python3.7:
-  image: $CONTAINER_REGISTRY:python3.7
-  stage: test
-  script:
-    - python3 -m unittest discover -v
-
-tests:python3.8:
-  image: $CONTAINER_REGISTRY:python3.8
-  stage: test
-  script:
-    - python3 -m unittest discover -v
-
-tests:python3.9:
-  image: $CONTAINER_REGISTRY:python3.9
-  stage: test
-  script:
-    - python3 -m unittest discover -v
-
-tests:python3.10:
-  image: $CONTAINER_REGISTRY:python3.10
-  stage: test
-  script:
-    - python3 -m unittest discover -v
-
-tests:python3.11:
-  image: $CONTAINER_REGISTRY:python3.11
-  stage: test
-  script:
-    - python3 -m unittest discover -v
-
-tests:python3.12:
-  image: $CONTAINER_REGISTRY:python3.12
-  stage: test
-  script:
-    - python3 -m unittest discover -v
-
-tests:python3.13:
-  image: $CONTAINER_REGISTRY:python3.13
-  stage: test
-  script:
-    - python3 -m unittest discover -v
-
-tests:python3.14:
-  image: $CONTAINER_REGISTRY:python3.14
-  stage: test
-  script:
-    - python3 -m unittest discover -v