Get arch from system when building debian package (#298)

deb_from_installation.sh

@@ -32,10 +32,12 @@ if [ ! -d $INSTALL_DIR ] ; then
     exit 1
 fi
 
+ARCH=$(dpkg --print-architecture)
+
 rm -rf build/pkg
 mkdir -p build/pkg/opt
 mkdir -p build/pkg/DEBIAN
 sed -e s/VERSION/$VERSION/ wasi-sdk.control > build/pkg/DEBIAN/control
 cp -R $INSTALL_DIR build/pkg/opt/
-cd build && dpkg-deb -b pkg wasi-sdk_$VERSION\_amd64.deb && cd ..
-mv build/wasi-sdk_$VERSION\_amd64.deb $OUTDIR/
+cd build && dpkg-deb -b pkg wasi-sdk_$VERSION\_$ARCH\.deb && cd ..
+mv build/wasi-sdk_$VERSION\_$ARCH\.deb $OUTDIR/