Update NuGet tooling

- Add officially supported RID for Linux and macOS
- Ensure reproducible builds with fixed image versions
- Add additional dependencies
- Add dirty workaround (for now) for macOS builds

tools/nuget/docker.linux-x64.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# Automatically exit on error
+set -e
+
+apt-get update
+
+apt-get install -y \
+    git \
+    libfreetype6-dev \
+    xorg-dev \
+    libxrandr-dev \
+    libxcursor-dev \
+    libudev-dev \
+    libgl1-mesa-dev \
+    libflac-dev \
+    libogg-dev \
+    libvorbis-dev \
+    libopenal-dev \
+    cmake \
+    g++
+
+./build.linux.sh linux-x64