Fix grow_root_partition_automatically for ClusterAutoscaler nodes

[artem-zinnatullin]

With this change nodes created by ClusterAutoscaler now respect global grow_root_partition_automatically: false as expected:

grow_root_partition_automatically: false

addons:
  cluster_autoscaler:
    enabled: true

Checked on a node created by ClusterAutoscaler:

root@tommy-test-cx23-workers-pool-xxx:~# cat /var/lib/cloud/instance/user-data.txt
ls -la /etc/growroot-disabled
-rw-r--r-- 1 root root 5 Dec 23 02:16 /etc/growroot-disabled

root@tommy-test-cx23-workers-pool-xxx:~# cat /var/lib/cloud/instance/user-data.txt
#cloud-config
preserve_hostname: true



write_files:
- content: |
    true
  path: /etc/growroot-disabled

Fixes #698.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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[artem-zinnatullin]

@vitobotta I merged master to get the CI builds working and it's ready for review, it's a very important fix 😅

[privatecoder]

@artem-zinnatullin check this (you have that change as well).

@vitobotta: For autoscaled nodes the grow_root_partition_automatically-setting isn't passed to cloud_init, so it falls back to true, which skips creating /etc/growroot-disabled.

I have just tested it with only these two lines added and it works fine, i.e. /etc/growroot-disabled is created on an autoscaled node with the global setting grow_root_partition_automatically: false