Only run modprobe in %post if the system is running

When the package is installed e.g., in a bootc
container, it does not make sense to load kernel
modules because the kernel is not yet booted.

Resolves: RHEL-78695

i2c-tools.spec

@@ -114,7 +114,7 @@ echo 'i2c-dev' > $RPM_BUILD_ROOT%{_prefix}/lib/modules-load.d/%{name}.conf
 
 %post
 # load i2c-dev after the first install
-if [ "$1" = 1 ] ; then
+if [ "$1" = 1 ] && systemctl is-system-running > /dev/null; then
   /usr/sbin/modprobe i2c-dev
 fi
 exit 0