Update Dockerfile

action/Dockerfile

@@ -10,6 +10,20 @@ LABEL "repository"="http://github.com/webbertakken/unity-actions"
 LABEL "homepage"="http://github.com/webbertakken/unity-actions"
 LABEL "maintainer"="Webber Takken <webber@takken.io>"
 
+# Dependencies for glvnd and X11.
+RUN apt-get update \
+  && apt-get install -y -qq --no-install-recommends \
+    libglvnd0 \
+    libgl1 \
+    libglx0 \
+    libegl1 \
+    libxext6 \
+    libx11-6 \
+  && rm -rf /var/lib/apt/lists/*
+# Env vars for the nvidia-container-runtime.
+ENV NVIDIA_VISIBLE_DEVICES all
+ENV NVIDIA_DRIVER_CAPABILITIES graphics,utility,compute
+
 ADD steps /steps
 RUN chmod -R +x /steps
 ADD entrypoint.sh /entrypoint.sh