dracut: add dependency network to ignition-mount.service

[tormath1]

On some providers (like Equinix Metal), there is a network dependency for the umount stage, network must be still around when ExecStop is executed.

Thanks @dustymabe for the suggestion on the fix. :muscle:

---

Tested on Flatcar CI with Equinix Metal tests:

• working: http://bincache.flatcar-linux.net/testing/9999.0.1+tormath1-ignition/amd64/equinix_metal/_kola_temp/equinixmetal-2024-09-12-1117-222/kubeadm.v1.28.7.calico.base/5c53442c-d350-41dd-9fe3-eeaf1c726cd4/console.txt

  [   17.117250] ignition[1066]: INFO     : Stage: umount
  [   17.134237] ignition[1066]: INFO     : no configs at "/usr/lib/ignition/base.d"
  [   17.144233] ignition[1066]: INFO     : no config dir at "/usr/lib/ignition/base.platform.d/packet"
  [   17.155231] ignition[1066]: INFO     : umount: umount passed
  [   17.163285] ignition[1066]: INFO     : POST message to Packet Timeline
  [   17.172314] ignition[1066]: INFO     : GET https://metadata.packet.net/metadata: attempt #1
  [   17.182386] systemd[1]: Stopping ignition-mount.service - Ignition (mount)...
  [   17.192471] systemd[1]: remount-sysroot.service - Remount Root File System was skipped because of an unmet condition check (ConditionPathIsReadWrite=!/sysroot).
  [   17.209370] systemd[1]: systemd-udev-trigger.service: Deactivated successfully.
  [   17.219369] systemd[1]: Stopped systemd-udev-trigger.service - Coldplug All udev Devices.
  [   17.229791] systemd[1]: dracut-pre-trigger.service: Deactivated successfully.
  [   17.239272] systemd[1]: Stopped dracut-pre-trigger.service - dracut pre-trigger hook.
  [   17.249398] systemd[1]: initrd-cleanup.service: Deactivated successfully.
  [   17.258429] systemd[1]: Finished initrd-cleanup.service - Cleaning Up and Shutting Down Daemons.
  [   17.525189] ignition[1066]: INFO     : GET result: OK
  [   17.790691] ignition[1066]: INFO     : Ignition finished successfully
  ...
  [   17.943385] systemd[1]: Stopped target network.target - Network.
  [  OK  ] Stopped target sockets.target - Socket Units.

• not working: http://bincache.flatcar-linux.net/testing/4088.0.0+nightly-20240909-2100/amd64/equinix_metal/_kola_temp/equinixmetal-2024-09-10-2311-53/kubeadm.v1.28.7.calico.base/5ad7f3ac-e442-498d-a033-447c14c186f9/console.txt

  
  [   21.915639] systemd[1]: Stopped target network.target - Network.
  ...
  [   22.590416] ignition[1212]: INFO     : Ignition 2.19.0
  [   22.605169] ignition[1212]: INFO     : Stage: umount
       Stopping systemd-networkd.service - Network Configuration...

[ 22.605284] ignition[1212]: INFO : no configs at "/usr/lib/ignition/base.d" [ 22.629140] ignition[1212]: INFO : no config dir at "/usr/lib/ignition/base.platform.d/packet" Stopping systemd-resolved.service - Network Name Resolution...

[ 22.629185] ignition[1212]: INFO : umount: umount passed [ OK ] Stopped systemd-udev-trigger.service - Coldplug All udev Devices.

[ 32.565905] ignition[1212]: INFO : GET error: Get "https://metadata.packet.net/metadata": net/http: timeout awaiting response headers [ 32.766388] ignition[1212]: INFO : GET https://metadata.packet.net/metadata: attempt #2 [ * ] Job ignition-mount.service/stop running (11s / 1min 30s)

M [ * ] Job ignition-mount.service/stop running (11s / 1min 30s)

[dustymabe]

this LGTM - @jlebon @prestist - WDYT?