[build] Add script for building in the Steam Runtime

build-steamrt.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+set -e
+
+pushd `dirname $0`
+  if [ -f /.dockerenv ]; then
+    # If we are in a docker container then build...
+    export CC=/opt/gcc-9.2/bin/gcc-9.2
+    export CXX=/opt/gcc-9.2/bin/g++-9.2
+
+    rm -rf build.native
+
+    meson --buildtype release \
+          --strip             \
+          build.native
+
+    pushd build.native
+      ninja
+    popd
+  else
+    # Launcher our docker container to build...
+    sudo docker run -it --rm --name dxvk-steamrt-instance -v $(pwd):/dxvk dxvk-steamrt /dxvk/build-steamrt.sh
+  fi
+popd