feat(os): support NI Linux Real-Time's opkg package manager (#870)

NI Linux Real-Time is a Yocto Linux-based distribution used with
NI's embedded and real-time controllers.

Related links:
- https://www.ni.com/en/shop/linux/introduction-to-ni-linux-real-time.html
- https://github.com/ni/nilrt
- https://github.com/ni/nilrt-docs

src/steps/os/os_release/nilrt

@@ -0,0 +1,8 @@
+ID=nilrt
+NAME="NI Linux Real-Time"
+VERSION="10.0 (kirkstone)"
+VERSION_ID=10.0
+PRETTY_NAME="NI Linux Real-Time 10.0 (kirkstone)"
+DISTRO_CODENAME="kirkstone"
+BUILD_ID="23.8.0f153-x64"
+VERSION_CODENAME="kirkstone"