CI Linux arm: disable features, install deps

Fixed the feature set - some features were disabled:
- CUDA features
- lavc vdpau
- lavc vaapi
- Qt GUI
- Cineform

dependencies installed:
- libsdl2-ttf
- libsdl2-mixer

.github/scripts/Linux/arm/bootstrap.sh

@@ -47,7 +47,8 @@ apt -y install libasound2-dev portaudio19-dev libjack-dev
 apt -y install libglew-dev libglfw3-dev libglm-dev
 apt -y install libcaca-dev libmagickwand-dev libnatpmp-dev libopencv-core-dev libopencv-imgproc-dev libv4l-dev
 apt -y install libavcodec-dev libavformat-dev libswscale-dev libraspberrypi-dev
-apt -y install libdrm-dev
+apt -y install libdrm-dev\
+  libsdl2-mixer-dev libsdl2-ttf-dev\
 
 /.github/scripts/install-common-deps.sh
 /.github/scripts/Linux/install_others.sh ndi pipewire ximea

.github/scripts/environment.sh

@@ -74,9 +74,14 @@ export FEATURES="\
 CUDA_FEATURES="--enable-cuda_dxt --enable-gpujpeg --enable-ldgm-gpu --enable-uyvy"
 case "$RUNNER_OS" in
         Linux)
-                FEATURES="$FEATURES $CUDA_FEATURES --enable-plugins\
- --enable-alsa --enable-lavc-hw-accel-vaapi --enable-lavc-hw-accel-vdpau\
- --enable-pipewire-audio --enable-v4l2"
+                FEATURES="$FEATURES --enable-plugins --enable-alsa \
+--enable-pipewire-audio --enable-v4l2"
+                if [ "$(uname -m)" = x86_64 ]; then
+                        FEATURES="$FEATURES $CUDA_FEATURES \
+--enable-lavc-hw-accel-vaapi --enable-lavc-hw-accel-vdpau"
+                else # arm
+                        FEATURES="$$FEATURES --disable-qt"
+                fi
                 ;;
         macOS)
                 FEATURES="$FEATURES --enable-avfoundation --enable-coreaudio --enable-syphon"
@@ -90,7 +95,11 @@ case "$RUNNER_OS" in
                 ;;
 esac
 
-if [ "$(uname -s)" != Darwin ] || [ "$(uname -m)" != arm64 ]; then
+is_arm() {
+        uname_m=$(uname -m)
+        expr "$uname_m" : arm > /dev/null || [ "$uname_m" = aarch64 ]
+}
+if ! is_arm; then
         FEATURES="$FEATURES --enable-cineform"
 fi