[nvidia] Build NVIDIA packages

Provide pre-built kernel drivers that are built against the running
Linux kernel.

There is no GitHub Actions workflow for this right now. The
upstream build scripts require passing in the required private GPG
key password via standard input. This cannot be addressed until
later if we decide to fork those scripts.

For now, we are still relying on the open source NVIDIA drivers
due to Gamescope compatibility issues.

.gitignore

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+yum-packaging-precompiled-kmod

nvidia.sh

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+#!/bin/bash
+
+dnf install -y createrepo_c git kernel-devel openssl rpm-build rpm-sign
+
+#FIXME: This hack installs the latest kernel and then downgrades to the
+# Playtron OS kernel. This is the easiest way to install the correct
+# kernel version.
+dnf copr enable -y playtron/gaming
+dnf install -y kernel-devel kernel-headers
+dnf downgrade -y kernel-devel kernel-headers
+
+git clone https://github.com/NVIDIA/yum-packaging-precompiled-kmod.git
+cd yum-packaging-precompiled-kmod
+mkdir -p ~/precompiled-kmod/SPECS/
+
+# Workaround issues in the build script by manually generating some files.
+## Copy and rename the kmod-nvidia.spec file. The old 'yum-kmond-nvidia.spec' is unused.
+cp ./dnf-kmod-nvidia.spec ~/precompiled-kmod/SPECS/kmod-nvidia.spec
+## Download 'primary.xml.gz' repository data.
+baseURL="http://developer.download.nvidia.com/compute/cuda/repos"
+### "fedora38" is not available yet.
+distro="fedora37"
+arch="x86_64"
+curl "http://developer.download.nvidia.com/compute/cuda/repos/${distro}/${arch}/$(curl -sL http://developer.download.nvidia.com/compute/cuda/repos/${distro}/${arch}/repodata/repomd.xml | grep primary.xml | cut -d\" -f2)" --output primary.xml.gz
+gunzip primary.xml.gz
+# Find all available versions of the NVIDIA driver that can be re-packaged.
+grep -o -P "5[0-9]+\.[0-9]+\.[0-9]+" primary.xml | sort | uniq
+# Download and use a version from the NVIDIA driver archive:
+# https://www.nvidia.com/en-us/drivers/unix/linux-amd64-display-archive/
+
+# Download this dependency to help with creating a modular repository.
+wget https://raw.githubusercontent.com/NVIDIA/cuda-repo-management/main/genmodules.py
+
+# Override the detected kernel version parts. The local ".playtron" tag throws off the logic of the "build.sh" script.
+sed -i s'/kernel=.*/kernel="6.3.13"/'g build.sh
+sed -i s'/release=.*/release="200.playtron"/'g build.sh
+sed -i s'/dist=.*/dist=".fc38"/'g build.sh
+
+# NVIDIA packages are not available for Fedora 38 yet.
+# Instead, repackage Fedora 37 packages since they are forward compatible.
+bash build.sh ~/Downloads/NVIDIA-Linux-x86_64-535.54.03.run fedora37
+
+# The NVIDIA repository is stored at: ~/precompiled-kmod/repo