CI Linux FFmpeg: build own dav1d

current FFmpeg code requires dav1d >1.0.0 but in Ubuntu 22.04 is just 0.9.2

Author: MartinPulec

.github/scripts/Linux/download_build_ffmpeg.sh

@@ -9,6 +9,14 @@ install_aom() {(
         sudo cmake --install .
 )}
 
+install_dav1d() {(
+        git clone --depth 1 https://code.videolan.org/videolan/dav1d.git
+        mkdir -p dav1d/build && cd dav1d/build
+        meson ..
+        ninja
+        sudo ninja install
+)}
+
 install_libvpx() {
         (
         git clone --depth 1 https://github.com/webmproject/libvpx.git
@@ -54,6 +62,7 @@ if [ "$(lsb_release -rs)" = 20.04 ]; then
         git am -3 "$GITHUB_WORKSPACE/.github/scripts/Linux/ffmpeg-patches/0001-removed-bits-incompatible-with-old-vaapi.patch-noauto"
 fi
 install_aom
+install_dav1d
 ( git clone --depth 1 http://git.videolan.org/git/x264.git && cd x264 && ./configure --disable-static --enable-shared && make -j "$(nproc)" && sudo make install || exit 1 )
 install_libvpx
 install_nv_codec_headers

.github/scripts/Linux/install_ffmpeg.sh

@@ -5,6 +5,7 @@ cd /var/tmp/ffmpeg
 ( cd x264 && sudo make install )
 ( cd nv-codec-headers && sudo make install )
 ( cd aom/build && sudo cmake --install . )
+( cd dav1d/build && sudo ninja install )
 sudo cmake --install SVT-AV1/Build
 sudo cmake --install SVT-HEVC/Build/linux/Release
 sudo cmake --install SVT-VP9/Build

.github/scripts/Linux/prepare.sh

@@ -37,7 +37,7 @@ sudo apt install $sdl2_mix_build_dep $sdl2_ttf_build_dep
 # for FFmpeg - libzmq3-dev needs to be ignored (cannot be installed, see run #380)
 ffmpeg_build_dep=$(get_build_deps_excl ffmpeg 'libzmq3-dev\|libsdl2-dev')
 # shellcheck disable=SC2086 # intentional
-sudo apt install $ffmpeg_build_dep libdav1d-dev libde265-dev
+sudo apt install $ffmpeg_build_dep libde265-dev meson
 sudo apt-get -y remove 'libavcodec*' 'libavutil*' 'libswscale*' libvpx-dev 'libx264*' nginx
 # own x264 build
 sudo apt --no-install-recommends install asciidoc xmlto