CI Linux: use Qt6 in ubuntu-22.04

Author: MartinPulec

.github/scripts/Linux/prepare.sh

@@ -44,7 +44,11 @@ ffmpeg_build_dep=$(get_build_deps_excl ffmpeg 'nonexistent-placeholder')
 sudo apt install $ffmpeg_build_dep libde265-dev libopenh264-dev
 sudo apt-get -y remove 'libavcodec*' 'libavutil*' 'libswscale*' libvpx-dev nginx
 
-sudo apt install qtbase5-dev
+sudo apt install qt6-base-dev
+# https://bugs.launchpad.net/ubuntu/+source/qtchooser/+bug/1964763 bug workaround
+sudo qtchooser -install qt6 "$(command -v qmake6)" # askubuntu.com/a/1460243
+sudo ln -n "/usr/lib/$(uname -m)-linux-gnu/qt-default/qtchooser/qt6.conf" \
+ "/usr/lib/$(uname -m)-linux-gnu/qt-default/qtchooser/default.conf"
 
 # Install cross-platform deps
 "$GITHUB_WORKSPACE/.github/scripts/install-common-deps.sh"

.github/scripts/Linux/utils/Dockerfile.ubuntu

@@ -1,4 +1,6 @@
 # inspired by https://github.com/aferrero2707/appimage-testsuite
 # installing libraries included in https://raw.githubusercontent.com/probonopd/AppImages/master/excludelist
 FROM ubuntu:22.04
-RUN apt-get update && apt-get install -y libasound2 libegl1-mesa libfontconfig1 libgl1-mesa-glx libgmp10 libharfbuzz0b libp11-kit0 libx11-6 xvfb
+RUN apt-get update
+RUN apt-get install -y libasound2 libegl1-mesa libfontconfig1 libgl1-mesa-glx \
+    libgmp10 libharfbuzz0b libopengl0 libp11-kit0 libx11-6 xvfb