Remove Cirrus CI

See #12626

.cirrus.yml

@@ -1,49 +0,0 @@
-env:
-    CIRRUS_CLONE_DEPTH: 100
-    CI: 1
-
-linux_task:
-    matrix:
-        - name: alpine
-          container: &step
-              image: ghcr.io/krobelus/fish-ci/alpine:latest
-              memory: 4GB
-        - name: ubuntu-oldest-supported
-          container:
-              <<: *step
-              image: ghcr.io/krobelus/fish-ci/ubuntu-oldest-supported:latest
-    tests_script:
-        # cirrus at times gives us 32 procs and 2 GB of RAM
-        # Unrestriced parallelism results in OOM
-        - lscpu || true
-        - (cat /proc/meminfo | grep MemTotal) || true
-        - mkdir build && cd build
-        - FISH_TEST_MAX_CONCURRENCY=6 cmake -G Ninja -DCMAKE_BUILD_TYPE=Debug ..
-        - ninja -j 6 fish
-        - ninja fish_run_tests
-    only_if: $CIRRUS_REPO_OWNER == 'fish-shell'
-
-freebsd_task:
-    matrix:
-        - name: FreeBSD Stable
-          freebsd_instance:
-              image: freebsd-15-0-release-amd64-ufs # updatecli.d/cirrus-freebsd.yml
-    tests_script:
-        - pkg update
-        - pkg install -y cmake-core devel/pcre2 devel/ninja gettext git-lite lang/rust misc/py-pexpect
-        # libclang.so is a required build dependency for rust-c++ ffi bridge
-        - pkg install -y llvm
-        # BSDs have the following behavior: root may open or access files even if
-        # the mode bits would otherwise disallow it. For example root may open()
-        # a file with write privileges even if the file has mode 400. This breaks
-        # our tests for e.g. cd and path. So create a new unprivileged user to run tests.
-        - pw user add -n fish-user -s /bin/csh -d /home/fish-user
-        - mkdir -p /home/fish-user
-        - chown -R fish-user /home/fish-user
-        - mkdir build && cd build
-        - chown -R fish-user ..
-        - sudo -u fish-user -s whoami
-        - sudo -u fish-user -s FISH_TEST_MAX_CONCURRENCY=1 cmake -G Ninja -DCMAKE_BUILD_TYPE=Debug ..
-        - sudo -u fish-user -s ninja -j 6 fish
-        - sudo -u fish-user -s ninja fish_run_tests
-    only_if: $CIRRUS_REPO_OWNER == 'fish-shell'

README.rst

@@ -1,9 +1,5 @@
-.. |Cirrus CI| image:: https://api.cirrus-ci.com/github/fish-shell/fish-shell.svg?branch=master
-      :target: https://cirrus-ci.com/github/fish-shell/fish-shell
-      :alt: Cirrus CI Build Status
-
-`fish <https://fishshell.com/>`__ - the friendly interactive shell |Build Status| |Cirrus CI|
-=============================================================================================
+`fish <https://fishshell.com/>`__ - the friendly interactive shell |Build Status|
+=================================================================================
 
 fish is a smart and user-friendly command line shell for macOS, Linux,
 and the rest of the family. fish includes features like syntax