growpart: Add ConditionPathExists=/usr/bin/growpart

Hopefully eventually this gets rewritten in not-shell-script
and put somewhere saner. For now, avoid failing if people have
trimmed their images.

The growpart problem only comes with bootc-image-builder and
cloud environments anyways, it's not something we hit with
Anaconda installs or `bootc install to-filesystem`, so we can
avoid this.

Closes: https://gitlab.com/fedora/bootc/base-images/-/issues/34

Signed-off-by: Colin Walters <walters@verbum.org>

tier-1/bootc-generic-growpart.service

@@ -6,6 +6,8 @@ Documentation=https://gitlab.com/fedora/bootc/docs
 ConditionVirtualization=vm
 # This helps verify that we're running in a bootc/ostree based target.
 ConditionPathIsMountPoint=/sysroot
+# For someone making a smaller image, assume they have this handled.
+ConditionPathExists=/usr/bin/growpart
 # We want to run before any e.g. large container images might be pulled.
 DefaultDependencies=no
 Requires=sysinit.target