fix(docker): prevent using native arch / allow avx2

Author: scrubbbbs

docker/appimage.env

@@ -3,6 +3,10 @@ export CV_VERSION=2.4.13.7
 export INSTALL_SUDO=sudo
 export SYSTEM_INCLUDE_PATH=/usr/include
 
+# require AVX2 and prevent runner native arch from being used 
+export CXXFLAGS="-march=x86-64-v3"
+export CFLAGS="-march=x86-64-v3"
+
 FFMPEG_OPTIONS=$(cat <<EOF
     --enable-ffplay
     --enable-libfontconfig