fix: nvidia-container-toolkit missing files when mounting to Docker

Because NVIDIA never does it correctly, we have to do this ourselves.
- NVIDIA doesn't provide DRI3 support
- NVIDIA never fixes this issue properly
- NVIDIA likes to do things their own way
- Top 3 public clouds are obsessed with NVIDIA, so we have no choice but to support it

Ported from: https://github.com/selkies-project/docker-selkies-egl-desktop/blob/8dd03fba2a33ac774d61f46375a19ed1d9c5b51a/Dockerfile#L248-L264

Author: billy

root/etc/s6-overlay/s6-rc.d/init-video/run

@@ -33,3 +33,48 @@ do
         fi
     fi
 done
+
+# check if nvidia gpu is present
+if which nvidia-smi >/dev/null 2>&1; then
+    # nvidia-container-toolkit may not place files correctly, so we set them up here
+    echo "**** NVIDIA GPU detected ****"
+
+    OPENCL_ICDS=$(find /etc/OpenCL/vendors -name '*nvidia*.icd' 2>/dev/null)
+    # if no opencl icd found
+    if [ -z "${OPENCL_ICDS}" ]; then
+        echo "**** Setting up OpenCL ICD for NVIDIA ****"
+        mkdir -pm755 /etc/OpenCL/vendors/
+        echo "libnvidia-opencl.so.1" > /etc/OpenCL/vendors/nvidia.icd
+    fi
+
+    # find vulkan icds
+    ICDS=$(find /usr/share/vulkan/icd.d /etc/vulkan/icd.d -name '*nvidia*.json' 2>/dev/null)
+    # if no icd found
+    if [ -z "${ICDS}" ]; then
+        echo "**** Setting up Vulkan ICD for NVIDIA ****"
+        # get vulkan api version
+        VULKAN_API_VERSION=$(ldconfig -p | grep "libvulkan.so" | awk '{print $NF}' | xargs readlink | grep -oE "[0-9]+\.[0-9]+\.[0-9]+")
+        mkdir -pm755 /etc/vulkan/icd.d/
+        echo "{\n\
+    \"file_format_version\" : \"1.0.0\",\n\
+    \"ICD\": {\n\
+        \"library_path\": \"libGLX_nvidia.so.0\",\n\
+        \"api_version\" : \"${VULKAN_API_VERSION}\"\n\
+    }\n\
+}" > /etc/vulkan/icd.d/nvidia_icd.json
+    fi
+
+    # find glvnd egl_vendor files
+    EGLS=$(find /usr/share/glvnd/egl_vendor.d /etc/glvnd/egl_vendor.d -name '*nvidia*.json' 2>/dev/null)
+    # if no egl_vendor file found
+    if [ -z "${EGLS}" ]; then
+        echo "**** Setting up EGL vendor file for NVIDIA ****"
+        mkdir -pm755 /etc/glvnd/egl_vendor.d/
+        echo "{\n\
+    \"file_format_version\" : \"1.0.0\",\n\
+    \"ICD\": {\n\
+        \"library_path\": \"libEGL_nvidia.so.0\"\n\
+    }\n\
+}" > /etc/glvnd/egl_vendor.d/10_nvidia.json
+    fi
+fi