feat(server): transcoding hardware acceleration (#3171)

* added transcode configs for nvenc,qsv and vaapi

* updated dev docker compose

* added software fallback

* working vaapi

* minor fixes and added tests

* updated api

* compile libvips

* move hwaccel settings to `hwaccel.yml`

* changed default dockerfile, moved `readdir` call

* removed unused import

* minor cleanup

* fix for arm build

* added documentation, minor fixes

* added intel driver

* updated docs

styling

* uppercase codec and api names

* formatting

* added tests

* updated docs

* removed semicolons

* added link to `hwaccel.yml`

* added newlines

* added `hwaccel` section to docker-compose.prod.yml

* ensure mesa drivers are installed

* switch to mimalloc for sharp

* moved build version and sha256 to json

* let libmfx set the render device

* possible fix for vp9 on qsv

* updated tests

* formatting

* review suggestions

* semicolon

* moved `LD_PRELOAD` to start script

* switched to jellyfin's ffmpeg package

* fixed dockerfile

* use cqp instead of icq for qsv vp9

* updated dockerfile

* added sha256sum for other platforms

* fixtures

server/bin/build-libvips.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -e
+
+LOCK=$(jq -c '.packages[] | select(.name == "libvips")' build-lock.json)
+LIBVIPS_VERSION=${LIBVIPS_VERSION:=$(echo $LOCK | jq -r '.version')}
+LIBVIPS_SHA256=${LIBVIPS_SHA256:=$(echo $LOCK | jq -r '.sha256')}
+
+echo "$LIBVIPS_SHA256  vips-$LIBVIPS_VERSION.tar.xz" > libvips.sha256
+mkdir -p libvips
+wget -nv https://github.com/libvips/libvips/releases/download/v${LIBVIPS_VERSION}/vips-${LIBVIPS_VERSION}.tar.xz
+sha256sum -c libvips.sha256
+tar -xvf vips-${LIBVIPS_VERSION}.tar.xz -C libvips --strip-components=1
+rm vips-${LIBVIPS_VERSION}.tar.xz
+rm libvips.sha256
+cd libvips
+meson setup build --buildtype=release --libdir=lib -Dintrospection=false
+cd build
+# ninja test  # tests set concurrency too high for arm/v7
+ninja install
+cd .. && rm -rf libvips
+ldconfig /usr/local/lib