diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
deleted file mode 100644
index 31066604616..00000000000
--- a/.gitlab-ci.yml
+++ /dev/null
@@ -1,126 +0,0 @@
-stages:
-  - build
-
-variables:
-  # Commit of ghc/ci-images repository from which to pull Docker images
-  DOCKER_REV: "a9297a370025101b479cfd4977f8f910814e03ab"
-
-  GHC_VERSION: 9.6.4
-  CABAL_INSTALL_VERSION: 3.10.2.0
-
-workflow:
-  rules:
-    - if: $CI_COMMIT_TAG
-      when: always
-    # Triggered if you start it from the gitlab web ui
-    - if: '$CI_PIPELINE_SOURCE == "web"'
-      when: always
-    - when: never
-
-.build:
-  stage: build
-  script:
-    - bash .gitlab/ci.sh
-  artifacts:
-    expire_in: 2 week
-    paths:
-      - out/*
-
-linux:
-  extends: .build
-  parallel:
-    matrix:
-      - ARCH: i386
-        TAG: x86_64-linux
-        OS:
-          - deb9
-          - deb10
-      - ARCH: x86_64
-        TAG: x86_64-linux
-        OS:
-          - centos7
-          - deb9
-          - deb10
-          - deb11
-          - deb12
-          - fedora33
-          - fedora36
-          - fedora38
-          - rocky8
-          - ubuntu18_04
-          - ubuntu20_04
-          - ubuntu22_04
-      - ARCH: aarch64
-        TAG: aarch64-linux
-        OS:
-          - deb10
-          - deb11
-          - deb12
-  tags:
-    - $TAG
-  image: "registry.gitlab.haskell.org/ghc/ci-images/$PLATFORM:$DOCKER_REV"
-  variables:
-    PLATFORM: "${ARCH}-linux-${OS}"
-    TARBALL_ARCHIVE_SUFFIX: $PLATFORM
-    TARBALL_EXT: tar.xz
-    ADD_CABAL_ARGS: "--enable-split-sections"
-
-alpine-linux:
-  extends: .build
-  parallel:
-    matrix:
-      - ARCH: [i386, x86_64]
-        OS: [alpine3_12, alpine3_15, alpine3_17]
-        TAG: x86_64-linux
-      # Was 3_18 for i386 intentionally left off?
-      - ARCH: x86_64
-        OS: alpine3_18
-        TAG: x86_64-linux
-      - ARCH: [aarch64]
-        OS: [alpine3_18]
-        TAG: aarch64-linux
-  tags:
-    - $TAG
-  before_script:
-    # for cabal build
-    - sudo apk add --no-cache zlib zlib-dev zlib-static
-  image: "registry.gitlab.haskell.org/ghc/ci-images/$PLATFORM:$DOCKER_REV"
-  variables:
-    PLATFORM: "${ARCH}-linux-${OS}"
-    TARBALL_ARCHIVE_SUFFIX: $PLATFORM
-    TARBALL_EXT: tar.xz
-    ADD_CABAL_ARGS: "--enable-split-sections --enable-executable-static"
-
-darwin:
-  extends: .build
-  parallel:
-    matrix:
-      # Help me with names pls
-      - ARCH: x86_64
-        ARCHARCH: x86_64
-      - ARCH: aarch64
-        ARCHARCH: arm64
-  tags:
-    - ${ARCH}-darwin-m1
-  variables:
-    # Using 9.8.2 to work around
-    # https://gitlab.haskell.org/ghc/ghc/-/issues/24050
-    GHC_VERSION: 9.8.2
-    TARBALL_ARCHIVE_SUFFIX: ${ARCH}-darwin
-    TARBALL_EXT: tar.xz
-    ADD_CABAL_ARGS: ""
-  script:
-    - arch -${ARCHARCH} /bin/bash .gitlab/ci.sh
-
-x86_64-windows:
-  extends: .build
-  script:
-    - $env:CHERE_INVOKING = "yes"
-    - bash '-lc' "ADD_CABAL_ARGS=$env:ADD_CABAL_ARGS GHC_VERSION=$env:GHC_VERSION CABAL_INSTALL_VERSION=$CABAL_INSTALL_VERSION .gitlab/ci.sh"
-  tags:
-    - new-x86_64-windows
-  variables:
-    TARBALL_ARCHIVE_SUFFIX: x86_64-windows
-    TARBALL_EXT: zip
-    ADD_CABAL_ARGS: ""
-  retry: 2
diff --git a/.gitlab/brew.sh b/.gitlab/brew.sh
deleted file mode 100644
index b2771811d47..00000000000
--- a/.gitlab/brew.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/usr/bin/env bash
-
-set -Eeuo pipefail
-
-# Install brew locally in the project dir. Packages will also be installed here.
-# FIXME: Use brew in supported way. See
-# https://docs.brew.sh/Installation#untar-anywhere-unsupported
-brew_dir="${CI_PROJECT_DIR}/.brew"
-
-if [ ! -e "${brew_dir}" ]; then
-    mkdir -p "${brew_dir}"
-    curl --fail -L "https://github.com/Homebrew/brew/archive/refs/tags/${BREW_VERSION}.tar.gz" | tar xz --strip 1 -C "${brew_dir}"
-fi
-
-export PATH="${brew_dir}/bin:${brew_dir}/sbin:$PATH"
-
-# make sure to not pollute the machine with temp files etc
-mkdir -p $CI_PROJECT_DIR/.brew_cache
-export HOMEBREW_CACHE=$CI_PROJECT_DIR/.brew_cache
-mkdir -p $CI_PROJECT_DIR/.brew_logs
-export HOMEBREW_LOGS=$CI_PROJECT_DIR/.brew_logs
-mkdir -p /private/tmp/.brew_tmp
-export HOMEBREW_TEMP=/private/tmp/.brew_tmp
-
-# update and install packages
-brew update
-brew install ${1+"$@"}
diff --git a/.gitlab/ci.sh b/.gitlab/ci.sh
deleted file mode 100755
index 1515a6afe22..00000000000
--- a/.gitlab/ci.sh
+++ /dev/null
@@ -1,82 +0,0 @@
-#!/usr/bin/env bash
-
-set -Eeuo pipefail
-
-source "$CI_PROJECT_DIR/.gitlab/common.sh"
-
-if [[ "$(uname)" == "Linux" ]]; then
-    export PATH="/opt/ghc/${GHC_VERSION}/bin:${PATH}"
-# Not all runners use ci-images, so ghcup is used.
-else
-    . "$CI_PROJECT_DIR/.gitlab/ghcup.sh"
-fi
-
-export CABAL_DIR="$CI_PROJECT_DIR/cabal"
-
-case "$(uname)" in
-    MSYS_*|MINGW*)
-        export CABAL_DIR="$(cygpath -w "$CABAL_DIR")"
-        EXE_EXT=".exe"
-        ;;
-    *)
-        EXE_EXT=""
-        ;;
-esac
-
-mkdir -p "$CABAL_DIR"
-
-# https://github.com/haskell/cabal/issues/7313#issuecomment-811851884
-# and
-# https://github.com/haskellari/lukko/issues/17
-#
-# $PLATFORM comes from CI.
-if [ "$(getconf LONG_BIT)" = "32" -o "${PLATFORM:=xxx}" = "x86_64-linux-centos7" ] ; then
-    echo 'constraints: lukko -ofd-locking' >> cabal.release.project.local
-fi
-
-# In February 2024, cabal started using zlib-0.7.0.0, which uses pkg-config by
-# default. The GitLab CI environment doesn't (yet) supply pkg-config, and zlib
-# does just fine without it on modern GHCs. That said, the CI environment
-# probably *should* have pkg-config installed. See
-# https://github.com/haskell/cabal/issues/9774.
-echo 'constraints: zlib -pkg-config' >> cabal.release.project.local
-# Furthermore, on Windows, zlib claims that libz is shipped with GHC, so it just
-# uses @extra-libraries: z@ if pkg-config is False. If you are reading this
-# comment, however, this didn't work. Thus we switch to using the bundled libz,
-# as was done in zlib <0.7.0.0.
-case "$(uname)" in
-    MSYS_*|MINGW*)
-        echo 'constraints: zlib +bundled-c-zlib' >> cabal.release.project.local
-    ;;
-esac
-
-args=(
-    --disable-profiling
-    --enable-executable-stripping
-    --project-file=cabal.release.project
-    ${ADD_CABAL_ARGS}
-)
-
-run cabal update hackage.haskell.org,HEAD
-run cabal v2-build ${args[@]} cabal-install
-
-mkdir "$CI_PROJECT_DIR/out"
-cp "$(cabal list-bin ${args[@]} cabal-install:exe:cabal)" "$CI_PROJECT_DIR/out/cabal$EXE_EXT"
-cp dist-newstyle/cache/plan.json "$CI_PROJECT_DIR/out/plan.json"
-cd "$CI_PROJECT_DIR/out/"
-
-# create tarball/zip
-TARBALL_PREFIX="cabal-install-$("$CI_PROJECT_DIR/out/cabal" --numeric-version)"
-case "${TARBALL_EXT}" in
-    zip)
-        zip "${TARBALL_PREFIX}-${TARBALL_ARCHIVE_SUFFIX}.${TARBALL_EXT}" "cabal${EXE_EXT}" plan.json
-        ;;
-    tar.xz)
-        tar caf "${TARBALL_PREFIX}-${TARBALL_ARCHIVE_SUFFIX}.${TARBALL_EXT}" "cabal${EXE_EXT}" plan.json
-        ;;
-    *)
-        fail "Unknown TARBALL_EXT: ${TARBALL_EXT}"
-        ;;
-esac
-
-rm cabal plan.json
diff --git a/.gitlab/common.sh b/.gitlab/common.sh
deleted file mode 100644
index b6bce698c91..00000000000
--- a/.gitlab/common.sh
+++ /dev/null
@@ -1,49 +0,0 @@
-# Common bash utilities
-# ----------------------
-
-# Colors
-BLACK="0;30"
-GRAY="1;30"
-RED="0;31"
-LT_RED="1;31"
-BROWN="0;33"
-LT_BROWN="1;33"
-GREEN="0;32"
-LT_GREEN="1;32"
-BLUE="0;34"
-LT_BLUE="1;34"
-PURPLE="0;35"
-LT_PURPLE="1;35"
-CYAN="0;36"
-LT_CYAN="1;36"
-WHITE="1;37"
-LT_GRAY="0;37"
-
-# GitLab Pipelines log section delimiters
-# https://gitlab.com/gitlab-org/gitlab-foss/issues/14664
-start_section() {
-  name="$1"
-  echo -e "section_start:$(date +%s):$name\015\033[0K"
-}
-
-end_section() {
-  name="$1"
-  echo -e "section_end:$(date +%s):$name\015\033[0K"
-}
-
-echo_color() {
-  local color="$1"
-  local msg="$2"
-  echo -e "\033[${color}m${msg}\033[0m"
-}
-
-error() { echo_color "${RED}" "$1"; }
-warn() { echo_color "${LT_BROWN}" "$1"; }
-info() { echo_color "${LT_BLUE}" "$1"; }
-
-fail() { error "error: $1"; exit 1; }
-
-function run() {
-  info "Running $*..."
-  "$@" || ( error "$* failed"; return 1; )
-}
diff --git a/.gitlab/ghcup.sh b/.gitlab/ghcup.sh
deleted file mode 100644
index 98a8b433b79..00000000000
--- a/.gitlab/ghcup.sh
+++ /dev/null
@@ -1,38 +0,0 @@
-export GHCUP_INSTALL_BASE_PREFIX="$CI_PROJECT_DIR/toolchain"
-
-case "$(uname)" in
-    MSYS_*|MINGW*)
-        GHCUP_BINDIR="${GHCUP_INSTALL_BASE_PREFIX}/ghcup/bin"
-        ;;
-    *)
-        GHCUP_BINDIR="${GHCUP_INSTALL_BASE_PREFIX}/.ghcup/bin"
-        ;;
-esac
-
-mkdir -p "$GHCUP_BINDIR"
-export PATH="$GHCUP_BINDIR:$PATH"
-
-export BOOTSTRAP_HASKELL_NONINTERACTIVE=1
-export BOOTSTRAP_HASKELL_GHC_VERSION=$GHC_VERSION
-export BOOTSTRAP_HASKELL_CABAL_VERSION=$CABAL_INSTALL_VERSION
-export BOOTSTRAP_HASKELL_ADJUST_CABAL_CONFIG=yes
-# We don't use stack, and it isn't available on i386-deb9
-export BOOTSTRAP_HASKELL_INSTALL_NO_STACK=yes
-
-# for some reason the subshell doesn't pick up the arm64 environment on darwin
-# and starts installing x86_64 GHC
-case "$(uname -s)" in
-    "Darwin"|"darwin")
-        case "$(/usr/bin/arch)" in
-            aarch64|arm64|armv8l)
-                curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | arch -arm64 /bin/bash
-                ;;
-            *)
-                curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh
-                ;;
-        esac
-        ;;
-    *)
-        curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh
-        ;;
-esac