ci: drop Ubuntu 20.04 support (#6630)

.CI/CreateUbuntuDeb.sh

@@ -20,10 +20,6 @@ deb_path="Chatterino-ubuntu-${ubuntu_release}-x86_64.deb"
 
 # Refactor opportunity:
 case "$ubuntu_release" in
-    20.04)
-        # Qt6 static-linked deb, see https://github.com/Chatterino/docker
-        dependencies="libc6, libstdc++6, libblkid1, libbsd0, libexpat1, libffi7, libfontconfig1, libfreetype6, libglib2.0-0, libglvnd0, libglx0, libgraphite2-3, libharfbuzz0b, libicu66, libjpeg-turbo8, libmount1, libnotify4, libopengl0, libpcre2-16-0, libpcre3, libpng16-16, libselinux1, libssl1.1, libuuid1, libx11-xcb1, libxau6, libxcb1, libxcb-cursor0, libxcb-glx0, libxcb-icccm4, libxcb-image0, libxcb-keysyms1, libxcb-randr0, libxcb-render0, libxcb-render-util0, libxcb-shape0, libxcb-shm0, libxcb-sync1, libxcb-util1, libxcb-xfixes0, libxcb-xkb1, libxdmcp6, libxkbcommon0, libxkbcommon-x11-0, zlib1g"
-        ;;
     22.04)
         # Qt6 static-linked deb, see https://github.com/Chatterino/docker
         dependencies="libc6, libstdc++6, libglx0, libopengl0, libpng16-16, libharfbuzz0b, libfreetype6, libfontconfig1, libjpeg-turbo8, libxcb-glx0, libegl1, libx11-6, libxkbcommon0, libx11-xcb1, libxkbcommon-x11-0, libxcb-cursor0, libxcb-icccm4, libxcb-image0, libxcb-keysyms1, libxcb-randr0, libxcb-render-util0, libxcb-shm0, libxcb-sync1, libxcb-xfixes0, libxcb-render0, libxcb-shape0, libxcb-xkb1, libxcb1, libbrotli1, libglib2.0-0, zlib1g, libicu70, libpcre2-16-0, libssl3, libgraphite2-3, libexpat1, libuuid1, libxcb-util1, libxau6, libxdmcp6, libffi8, libmount1, libnotify4, libselinux1, libpcre3, libbsd0, libblkid1, libpcre2-8-0, libmd0"

.CI/full-ubuntu-build.sh

@@ -10,12 +10,6 @@ env
 BUILD_TESTS="On"
 BUILD_BENCHMARKS="ON"
 
-ubuntu_version="$(lsb_release -sr)"
-if [ "$ubuntu_version" = "20.04" ]; then
-    BUILD_TESTS="Off"
-    BUILD_BENCHMARKS="Off"
-fi
-
 rm -rf build
 mkdir build
 cmake \

.github/workflows/build.yml

@@ -32,13 +32,6 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: ubuntu-20.04
-            container: ghcr.io/chatterino/chatterino2-build-ubuntu-20.04:latest
-            qt-version: 6.7.2
-            force-lto: false
-            skip-artifact: false
-            skip-crashpad: false
-            build-deb: true
           - os: ubuntu-22.04
             container: ghcr.io/chatterino/chatterino2-build-ubuntu-22.04:latest
             qt-version: 6.7.2
@@ -333,12 +326,6 @@ jobs:
           path: release-artifacts/
 
       # Linux
-      - uses: actions/download-artifact@v6
-        name: Ubuntu 20.04 deb
-        with:
-          name: Chatterino-ubuntu-20.04-Qt-6.7.2.deb
-          path: release-artifacts/
-
       - uses: actions/download-artifact@v6
         name: Ubuntu 22.04 deb
         with:

BUILDING_ON_LINUX.md

@@ -8,10 +8,10 @@ For all dependencies below we use Qt 6. Our minimum supported version is Qt 5.15
 
 Building on Ubuntu requires Docker.
 
-Use <https://github.com/Chatterino/docker/pkgs/container/chatterino2-build-ubuntu-20.04> as your base if you're on Ubuntu 20.04.
-
 Use <https://github.com/Chatterino/docker/pkgs/container/chatterino2-build-ubuntu-22.04> if you're on Ubuntu 22.04.
 
+Use <https://github.com/Chatterino/docker/pkgs/container/chatterino2-build-ubuntu-24.04> if you're on Ubuntu 24.04.
+
 The built binary should be exportable from the final image & able to run on your system assuming you perform a static build. See our [build.yml GitHub workflow file](.github/workflows/build.yml) for the CMake line used for Ubuntu builds.
 
 ### Debian 13 (trixie) or later